156423929 has 2 divisors, whose sum is σ = 156423930. Its totient is φ = 156423928.

The previous prime is 156423887. The next prime is 156423931. The reversal of 156423929 is 929324651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135675904 + 20748025 = 11648^2 + 4555^2 .

It is a cyclic number.

It is not a de Polignac number, because 156423929 - 2¹² = 156419833 is a prime.

It is a Sophie Germain prime.

Together with 156423931, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (156423959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78211964 + 78211965.

It is an arithmetic number, because the mean of its divisors is an integer number (78211965).

Almost surely, 2^156423929 is an apocalyptic number.

It is an amenable number.

156423929 is a deficient number, since it is larger than the sum of its proper divisors (1).

156423929 is an equidigital number, since it uses as much as digits as its factorization.

156423929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The square root of 156423929 is about 12506.9552249938. The cubic root of 156423929 is about 538.8084483577.

The spelling of 156423929 in words is "one hundred fifty-six million, four hundred twenty-three thousand, nine hundred twenty-nine".