156565139 has 2 divisors, whose sum is σ = 156565140. Its totient is φ = 156565138.

The previous prime is 156565133. The next prime is 156565147. The reversal of 156565139 is 931565651.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156565139 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 156565096 and 156565105.

It is not a weakly prime, because it can be changed into another prime (156565133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78282569 + 78282570.

It is an arithmetic number, because the mean of its divisors is an integer number (78282570).

Almost surely, 2^156565139 is an apocalyptic number.

156565139 is a deficient number, since it is larger than the sum of its proper divisors (1).

156565139 is an equidigital number, since it uses as much as digits as its factorization.

156565139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121500, while the sum is 41.

The square root of 156565139 is about 12512.5992103959. The cubic root of 156565139 is about 538.9705340820.

The spelling of 156565139 in words is "one hundred fifty-six million, five hundred sixty-five thousand, one hundred thirty-nine".