157320261 has 24 divisors (see below), whose sum is σ = 274981824. Its totient is φ = 84608640.

The previous prime is 157320223. The next prime is 157320269. The reversal of 157320261 is 162023751.

It is a happy number.

It is not a de Polignac number, because 157320261 - 2⁹ = 157319749 is a prime.

It is a super-2 number, since 2×157320261² = 49499329042216242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157320269) 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, 72375 + ... + 74516.

It is an arithmetic number, because the mean of its divisors is an integer number (11457576).

Almost surely, 2^157320261 is an apocalyptic number.

It is an amenable number.

157320261 is a deficient number, since it is larger than the sum of its proper divisors (117661563).

157320261 is a wasteful number, since it uses less digits than its factorization.

157320261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146921 (or 146918 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 157320261 is about 12542.7373806518. The cubic root of 157320261 is about 539.8356392787.

The spelling of 157320261 in words is "one hundred fifty-seven million, three hundred twenty thousand, two hundred sixty-one".