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201997212481 = 4494412
BaseRepresentation
bin1011110000011111111…
…0001101101101000001
3201022101112101120222001
42330013332031231001
511302142241244411
6232443553144001
720410451655631
oct2740776155501
9638345346861
10201997212481
1178737184529
123319455b001
131608202b7cc
149ac34526c1
1553c3985dc1
hex2f07f8db41

201997212481 has 3 divisors (see below), whose sum is σ = 201997661923. Its totient is φ = 201996763040.

The previous prime is 201997212449. The next prime is 201997212563. The reversal of 201997212481 is 184212799102.

The square root of 201997212481 is 449441.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 15131214081 + 186865998400 = 123009^2 + 432280^2 .

It is not a de Polignac number, because 201997212481 - 25 = 201997212449 is a prime.

It is a super-2 number, since 2×2019972124812 (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201997212401) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 224721 + ... + 674161.

Almost surely, 2201997212481 is an apocalyptic number.

201997212481 is the 449441-st square number.

201997212481 is the 224721-st centered octagonal number.

It is an amenable number.

201997212481 is a deficient number, since it is larger than the sum of its proper divisors (449442).

201997212481 is an frugal number, since it uses more digits than its factorization.

201997212481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898882 (or 449441 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 201997212481 in words is "two hundred one billion, nine hundred ninety-seven million, two hundred twelve thousand, four hundred eighty-one".

Divisors: 1 449441 201997212481