156390431 has 2 divisors, whose sum is σ = 156390432. Its totient is φ = 156390430.

The previous prime is 156390419. The next prime is 156390433. The reversal of 156390431 is 134093651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 156390431 - 2²² = 152196127 is a prime.

It is a super-2 number, since 2×156390431² = 48915933816731522, which contains 22 as substring.

Together with 156390433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156390433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78195215 + 78195216.

It is an arithmetic number, because the mean of its divisors is an integer number (78195216).

Almost surely, 2^156390431 is an apocalyptic number.

156390431 is a deficient number, since it is larger than the sum of its proper divisors (1).

156390431 is an equidigital number, since it uses as much as digits as its factorization.

156390431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 156390431 is about 12505.6159784315. The cubic root of 156390431 is about 538.7699838805.

The spelling of 156390431 in words is "one hundred fifty-six million, three hundred ninety thousand, four hundred thirty-one".