997691013 has 40 divisors (see below), whose sum is σ = 1629736416. Its totient is φ = 603223200.

The previous prime is 997690997. The next prime is 997691041. The reversal of 997691013 is 310196799.

It is not a de Polignac number, because 997691013 - 2⁴ = 997690997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997691013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997691113) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 464923 + ... + 467063.

Almost surely, 2^997691013 is an apocalyptic number.

It is an amenable number.

997691013 is a deficient number, since it is larger than the sum of its proper divisors (632045403).

997691013 is a wasteful number, since it uses less digits than its factorization.

997691013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687 (or 2678 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 45.

The square root of 997691013 is about 31586.2472129881. The cubic root of 997691013 is about 999.2297445255.

The spelling of 997691013 in words is "nine hundred ninety-seven million, six hundred ninety-one thousand, thirteen".