157532991 has 24 divisors (see below), whose sum is σ = 266552064. Its totient is φ = 81834480.

The previous prime is 157532989. The next prime is 157533001. The reversal of 157532991 is 199235751.

It is not a de Polignac number, because 157532991 - 2¹ = 157532989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157532191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47095 + ... + 50328.

It is an arithmetic number, because the mean of its divisors is an integer number (11106336).

Almost surely, 2^157532991 is an apocalyptic number.

157532991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

157532991 is a deficient number, since it is larger than the sum of its proper divisors (109019073).

157532991 is a wasteful number, since it uses less digits than its factorization.

157532991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97451 (or 97444 counting only the distinct ones).

The product of its digits is 85050, while the sum is 42.

The square root of 157532991 is about 12551.2147220897. The cubic root of 157532991 is about 540.0788533683.

The spelling of 157532991 in words is "one hundred fifty-seven million, five hundred thirty-two thousand, nine hundred ninety-one".