156913809 has 16 divisors (see below), whose sum is σ = 233083200. Its totient is φ = 93231936.

The previous prime is 156913789. The next prime is 156913811. The reversal of 156913809 is 908319651.

It is not a de Polignac number, because 156913809 - 2²⁰ = 155865233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156913879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68239 + ... + 70500.

It is an arithmetic number, because the mean of its divisors is an integer number (14567700).

Almost surely, 2^156913809 is an apocalyptic number.

It is an amenable number.

156913809 is a deficient number, since it is larger than the sum of its proper divisors (76169391).

156913809 is a wasteful number, since it uses less digits than its factorization.

156913809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138784.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 156913809 is about 12526.5242186330. The cubic root of 156913809 is about 539.3703325907.

The spelling of 156913809 in words is "one hundred fifty-six million, nine hundred thirteen thousand, eight hundred nine".