156872137 has 8 divisors (see below), whose sum is σ = 159102504. Its totient is φ = 154656768.

The previous prime is 156872129. The next prime is 156872153. The reversal of 156872137 is 731278651.

It can be written as a sum of positive squares in 4 ways, for example, as 17065161 + 139806976 = 4131^2 + 11824^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 156872137 - 2³ = 156872129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 156872137.

It is not an unprimeable number, because it can be changed into a prime (156872197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18213 + ... + 25405.

It is an arithmetic number, because the mean of its divisors is an integer number (19887813).

Almost surely, 2^156872137 is an apocalyptic number.

It is an amenable number.

156872137 is a deficient number, since it is larger than the sum of its proper divisors (2230367).

156872137 is a wasteful number, since it uses less digits than its factorization.

156872137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7499.

The product of its digits is 70560, while the sum is 40.

The square root of 156872137 is about 12524.8607577090. The cubic root of 156872137 is about 539.3225810455.

The spelling of 156872137 in words is "one hundred fifty-six million, eight hundred seventy-two thousand, one hundred thirty-seven".