117855381 has 36 divisors (see below), whose sum is σ = 189577248. Its totient is φ = 63792432.

The previous prime is 117855379. The next prime is 117855383. The reversal of 117855381 is 183558711.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (117855379) and next prime (117855383).

It is not a de Polignac number, because 117855381 - 2¹ = 117855379 is a prime.

It is a super-2 number, since 2×117855381² = 27779781661310322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117855383) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1144176 + ... + 1144278.

Almost surely, 2^117855381 is an apocalyptic number.

It is an amenable number.

117855381 is a deficient number, since it is larger than the sum of its proper divisors (71721867).

117855381 is an equidigital number, since it uses as much as digits as its factorization.

117855381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 136 counting only the distinct ones).

The product of its digits is 33600, while the sum is 39.

The square root of 117855381 is about 10856.1218213504. The cubic root of 117855381 is about 490.2863535179.

Multiplying 117855381 by its product of digits (33600), we get a square (3959940801600 = 1989960²).

The spelling of 117855381 in words is "one hundred seventeen million, eight hundred fifty-five thousand, three hundred eighty-one".