997826931 has 10 divisors (see below), whose sum is σ = 1490581092. Its totient is φ = 665217900.

The previous prime is 997826903. The next prime is 997826969. The reversal of 997826931 is 139628799.

It is not a de Polignac number, because 997826931 - 2⁵ = 997826899 is a prime.

It is a super-2 number, since 2×997826931² = 1991317168457757522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (997826131) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6159345 + ... + 6159506.

Almost surely, 2^997826931 is an apocalyptic number.

997826931 is a deficient number, since it is larger than the sum of its proper divisors (492754161).

997826931 is a wasteful number, since it uses less digits than its factorization.

997826931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12318863 (or 12318854 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 997826931 is about 31588.3986773625. The cubic root of 997826931 is about 999.2751183402.

The spelling of 997826931 in words is "nine hundred ninety-seven million, eight hundred twenty-six thousand, nine hundred thirty-one".