157517997 has 48 divisors (see below), whose sum is σ = 265446720. Its totient is φ = 82349568.

The previous prime is 157517993. The next prime is 157518047. The reversal of 157517997 is 799715751.

It is not a de Polignac number, because 157517997 - 2² = 157517993 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157517993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 265333 + ... + 265925.

It is an arithmetic number, because the mean of its divisors is an integer number (5530140).

Almost surely, 2^157517997 is an apocalyptic number.

It is an amenable number.

157517997 is a deficient number, since it is larger than the sum of its proper divisors (107928723).

157517997 is a wasteful number, since it uses less digits than its factorization.

157517997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762 (or 755 counting only the distinct ones).

The product of its digits is 694575, while the sum is 51.

The square root of 157517997 is about 12550.6173951722. The cubic root of 157517997 is about 540.0617179115.

The spelling of 157517997 in words is "one hundred fifty-seven million, five hundred seventeen thousand, nine hundred ninety-seven".