82995271921 has 3 divisors (see below), whose sum is σ = 82995560011. Its totient is φ = 82994983832.

The previous prime is 82995271913. The next prime is 82995271963. The reversal of 82995271921 is 12917259928.

The square root of 82995271921 is 288089.

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., 63862849521 + 19132422400 = 252711^2 + 138320^2 .

It is not a de Polignac number, because 82995271921 - 2³ = 82995271913 is a prime.

It is a super-2 number, since 2×82995271921² (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 (82995271721) 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, 144045 + ... + 432133.

Almost surely, 2^82995271921 is an apocalyptic number.

82995271921 is the 288089-th square number.

82995271921 is the 144045-th centered octagonal number.

It is an amenable number.

82995271921 is a deficient number, since it is larger than the sum of its proper divisors (288090).

82995271921 is an frugal number, since it uses more digits than its factorization.

82995271921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576178 (or 288089 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 55.

The spelling of 82995271921 in words is "eighty-two billion, nine hundred ninety-five million, two hundred seventy-one thousand, nine hundred twenty-one".