156891 has 16 divisors (see below), whose sum is σ = 247808. Its totient is φ = 86400.

The previous prime is 156887. The next prime is 156899. The reversal of 156891 is 198651.

It is a happy number.

It is not a de Polignac number, because 156891 - 2² = 156887 is a prime.

It is a super-2 number, since 2×156891² = 49229571762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531 + ... + 771.

It is an arithmetic number, because the mean of its divisors is an integer number (15488).

2¹⁵⁶⁸⁹¹ is an apocalyptic number.

156891 is a deficient number, since it is larger than the sum of its proper divisors (90917).

156891 is a wasteful number, since it uses less digits than its factorization.

156891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282.

The product of its digits is 2160, while the sum is 30.

The square root of 156891 is about 396.0946856498. The cubic root of 156891 is about 53.9344197024.

The spelling of 156891 in words is "one hundred fifty-six thousand, eight hundred ninety-one".