156377981 has 8 divisors (see below), whose sum is σ = 162240000. Its totient is φ = 150567120.

The previous prime is 156377957. The next prime is 156377983. The reversal of 156377981 is 189773651.

156377981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156377981 is a prime.

It is a super-2 number, since 2×156377981² = 48908145883272722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156377983) 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, 6506 + ... + 18843.

It is an arithmetic number, because the mean of its divisors is an integer number (20280000).

Almost surely, 2^156377981 is an apocalyptic number.

It is an amenable number.

156377981 is a deficient number, since it is larger than the sum of its proper divisors (5862019).

156377981 is a wasteful number, since it uses less digits than its factorization.

156377981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25579.

The product of its digits is 317520, while the sum is 47.

The square root of 156377981 is about 12505.1181921644. The cubic root of 156377981 is about 538.7556866198.

The spelling of 156377981 in words is "one hundred fifty-six million, three hundred seventy-seven thousand, nine hundred eighty-one".