156631642 has 24 divisors (see below), whose sum is σ = 254339676. Its totient is φ = 72304128.

The previous prime is 156631637. The next prime is 156631661. The reversal of 156631642 is 246136651.

It can be written as a sum of positive squares in 6 ways, for example, as 88717561 + 67914081 = 9419^2 + 8241^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 156631598 and 156631607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28078 + ... + 33190.

Almost surely, 2^156631642 is an apocalyptic number.

156631642 is a deficient number, since it is larger than the sum of its proper divisors (97708034).

156631642 is a wasteful number, since it uses less digits than its factorization.

156631642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5202 (or 5185 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 156631642 is about 12515.2563697273. The cubic root of 156631642 is about 539.0468347704.

The spelling of 156631642 in words is "one hundred fifty-six million, six hundred thirty-one thousand, six hundred forty-two".