997157955 has 32 divisors (see below), whose sum is σ = 1641019968. Its totient is φ = 516672000.

The previous prime is 997157947. The next prime is 997157971. The reversal of 997157955 is 559751799.

It is not a de Polignac number, because 997157955 - 2³ = 997157947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 997157895 and 997157904.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 721365 + ... + 722745.

It is an arithmetic number, because the mean of its divisors is an integer number (51281874).

Almost surely, 2^997157955 is an apocalyptic number.

997157955 is a deficient number, since it is larger than the sum of its proper divisors (643862013).

997157955 is a wasteful number, since it uses less digits than its factorization.

997157955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2727.

The product of its digits is 4465125, while the sum is 57.

The square root of 997157955 is about 31577.8079511546. The cubic root of 997157955 is about 999.0517527781.

The spelling of 997157955 in words is "nine hundred ninety-seven million, one hundred fifty-seven thousand, nine hundred fifty-five".