156409881 has 16 divisors (see below), whose sum is σ = 221793600. Its totient is φ = 97763328.

The previous prime is 156409879. The next prime is 156409901. The reversal of 156409881 is 188904651.

It is not a de Polignac number, because 156409881 - 2¹ = 156409879 is a prime.

It is a super-2 number, since 2×156409881² = 48928101748868322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (156409801) 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, 8616 + ... + 19673.

It is an arithmetic number, because the mean of its divisors is an integer number (13862100).

Almost surely, 2^156409881 is an apocalyptic number.

It is an amenable number.

156409881 is a deficient number, since it is larger than the sum of its proper divisors (65383719).

156409881 is a wasteful number, since it uses less digits than its factorization.

156409881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28408.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 156409881 is about 12506.3936048727. The cubic root of 156409881 is about 538.7923182432.

The spelling of 156409881 in words is "one hundred fifty-six million, four hundred nine thousand, eight hundred eighty-one".