156404891 has 2 divisors, whose sum is σ = 156404892. Its totient is φ = 156404890.

The previous prime is 156404887. The next prime is 156404921. The reversal of 156404891 is 198404651.

It is a weak prime.

It is an emirp because it is prime and its reverse (198404651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156404891 - 2² = 156404887 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (156404491) 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, 78202445 + 78202446.

It is an arithmetic number, because the mean of its divisors is an integer number (78202446).

Almost surely, 2^156404891 is an apocalyptic number.

156404891 is a deficient number, since it is larger than the sum of its proper divisors (1).

156404891 is an equidigital number, since it uses as much as digits as its factorization.

156404891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 156404891 is about 12506.1941053224. The cubic root of 156404891 is about 538.7865884213.

The spelling of 156404891 in words is "one hundred fifty-six million, four hundred four thousand, eight hundred ninety-one".