157213231 has 16 divisors (see below), whose sum is σ = 182274048. Its totient is φ = 132818400.

The previous prime is 157213223. The next prime is 157213237. The reversal of 157213231 is 132312751.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 157213231 - 2³ = 157213223 is a prime.

It is a super-2 number, since 2×157213231² = 49432000002918722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157213196 and 157213205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157213237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158146 + ... + 159136.

It is an arithmetic number, because the mean of its divisors is an integer number (11392128).

Almost surely, 2^157213231 is an apocalyptic number.

157213231 is a deficient number, since it is larger than the sum of its proper divisors (25060817).

157213231 is a wasteful number, since it uses less digits than its factorization.

157213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302.

The product of its digits is 1260, while the sum is 25.

The square root of 157213231 is about 12538.4700422340. The cubic root of 157213231 is about 539.7131890278.

Adding to 157213231 its reverse (132312751), we get a palindrome (289525982).

The spelling of 157213231 in words is "one hundred fifty-seven million, two hundred thirteen thousand, two hundred thirty-one".