997538751 has 12 divisors (see below), whose sum is σ = 1571879400. Its totient is φ = 604568880.

The previous prime is 997538719. The next prime is 997538753. The reversal of 997538751 is 157835799.

It is not a de Polignac number, because 997538751 - 2⁵ = 997538719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997538753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5037976 + ... + 5038173.

It is an arithmetic number, because the mean of its divisors is an integer number (130989950).

Almost surely, 2^997538751 is an apocalyptic number.

997538751 is a deficient number, since it is larger than the sum of its proper divisors (574340649).

997538751 is a wasteful number, since it uses less digits than its factorization.

997538751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10076166 (or 10076163 counting only the distinct ones).

The product of its digits is 2381400, while the sum is 54.

The square root of 997538751 is about 31583.8368631805. The cubic root of 997538751 is about 999.1789096618.

The spelling of 997538751 in words is "nine hundred ninety-seven million, five hundred thirty-eight thousand, seven hundred fifty-one".