156155729 has 2 divisors, whose sum is σ = 156155730. Its totient is φ = 156155728.

The previous prime is 156155719. The next prime is 156155731. The reversal of 156155729 is 927551651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87928129 + 68227600 = 9377^2 + 8260^2 .

It is a cyclic number.

It is not a de Polignac number, because 156155729 - 2⁸ = 156155473 is a prime.

It is a super-2 number, since 2×156155729² = 48769223399042882, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 156155731, 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 (156155719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78077864 + 78077865.

It is an arithmetic number, because the mean of its divisors is an integer number (78077865).

Almost surely, 2^156155729 is an apocalyptic number.

It is an amenable number.

156155729 is a deficient number, since it is larger than the sum of its proper divisors (1).

156155729 is an equidigital number, since it uses as much as digits as its factorization.

156155729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94500, while the sum is 41.

The square root of 156155729 is about 12496.2285910590. The cubic root of 156155729 is about 538.5003303361.

The spelling of 156155729 in words is "one hundred fifty-six million, one hundred fifty-five thousand, seven hundred twenty-nine".