156225531 has 32 divisors (see below), whose sum is σ = 261093888. Its totient is φ = 80720640.

The previous prime is 156225521. The next prime is 156225541. The reversal of 156225531 is 135522651.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (156225521) and next prime (156225541).

It is not a de Polignac number, because 156225531 - 2¹⁴ = 156209147 is a prime.

It is a super-2 number, since 2×156225531² = 48812833072463922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156225521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43791 + ... + 47223.

It is an arithmetic number, because the mean of its divisors is an integer number (8159184).

Almost surely, 2^156225531 is an apocalyptic number.

156225531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

156225531 is a deficient number, since it is larger than the sum of its proper divisors (104868357).

156225531 is a wasteful number, since it uses less digits than its factorization.

156225531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651.

The product of its digits is 9000, while the sum is 30.

The square root of 156225531 is about 12499.0212016782. The cubic root of 156225531 is about 538.5805553802.

The spelling of 156225531 in words is "one hundred fifty-six million, two hundred twenty-five thousand, five hundred thirty-one".