156117381 has 24 divisors (see below), whose sum is σ = 248056704. Its totient is φ = 87030720.

The previous prime is 156117359. The next prime is 156117397. The reversal of 156117381 is 183711651.

It is not a de Polignac number, because 156117381 - 2⁹ = 156116869 is a prime.

It is a super-2 number, since 2×156117381² = 48745273300598322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156117881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6925 + ... + 18978.

It is an arithmetic number, because the mean of its divisors is an integer number (10335696).

Almost surely, 2^156117381 is an apocalyptic number.

It is an amenable number.

156117381 is a deficient number, since it is larger than the sum of its proper divisors (91939323).

156117381 is a wasteful number, since it uses less digits than its factorization.

156117381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25961 (or 25954 counting only the distinct ones).

The product of its digits is 5040, while the sum is 33.

The square root of 156117381 is about 12494.6941139029. The cubic root of 156117381 is about 538.4562459223.

The spelling of 156117381 in words is "one hundred fifty-six million, one hundred seventeen thousand, three hundred eighty-one".