156639139 has 4 divisors (see below), whose sum is σ = 165853224. Its totient is φ = 147425056.

The previous prime is 156639137. The next prime is 156639163. The reversal of 156639139 is 931936651.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 156639139 - 2¹ = 156639137 is a prime.

It is a super-2 number, since 2×156639139² = 49071639733322642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 156639095 and 156639104.

It is not an unprimeable number, because it can be changed into a prime (156639137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4607017 + ... + 4607050.

It is an arithmetic number, because the mean of its divisors is an integer number (41463306).

Almost surely, 2^156639139 is an apocalyptic number.

156639139 is a deficient number, since it is larger than the sum of its proper divisors (9214085).

156639139 is an equidigital number, since it uses as much as digits as its factorization.

156639139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9214084.

The product of its digits is 131220, while the sum is 43.

The square root of 156639139 is about 12515.5558805832. Note that the first 3 decimals coincide. The cubic root of 156639139 is about 539.0554349264.

The spelling of 156639139 in words is "one hundred fifty-six million, six hundred thirty-nine thousand, one hundred thirty-nine".