156431641 has 4 divisors (see below), whose sum is σ = 156567312. Its totient is φ = 156295972.

The previous prime is 156431623. The next prime is 156431657. The reversal of 156431641 is 146134651.

156431641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 156431641 - 2⁹ = 156431129 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156431141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66091 + ... + 68416.

It is an arithmetic number, because the mean of its divisors is an integer number (39141828).

Almost surely, 2^156431641 is an apocalyptic number.

It is an amenable number.

156431641 is a deficient number, since it is larger than the sum of its proper divisors (135671).

156431641 is a wasteful number, since it uses less digits than its factorization.

156431641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135670.

The product of its digits is 8640, while the sum is 31.

The square root of 156431641 is about 12507.2635296455. The cubic root of 156431641 is about 538.8173029759.

The spelling of 156431641 in words is "one hundred fifty-six million, four hundred thirty-one thousand, six hundred forty-one".