997517473 has 4 divisors (see below), whose sum is σ = 1029695488. Its totient is φ = 965339460.

The previous prime is 997517471. The next prime is 997517491. The reversal of 997517473 is 374715799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 997517473 - 2¹ = 997517471 is a prime.

It is a super-2 number, since 2×997517473² = 1990082217880611458, which contains 22 as substring.

It is the 31584-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 997517473.

It is not an unprimeable number, because it can be changed into a prime (997517471) by changing a digit.

It is a nontrivial repunit in base 31583.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16088961 + ... + 16089022.

It is an arithmetic number, because the mean of its divisors is an integer number (257423872).

Almost surely, 2^997517473 is an apocalyptic number.

It is an amenable number.

997517473 is a deficient number, since it is larger than the sum of its proper divisors (32178015).

997517473 is a wasteful number, since it uses less digits than its factorization.

997517473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32178014.

The product of its digits is 1666980, while the sum is 52.

The square root of 997517473 is about 31583.5000118733. The cubic root of 997517473 is about 999.1718052829.

The spelling of 997517473 in words is "nine hundred ninety-seven million, five hundred seventeen thousand, four hundred seventy-three".