113856381 has 16 divisors (see below), whose sum is σ = 171054720. Its totient is φ = 74833920.

The previous prime is 113856373. The next prime is 113856401. The reversal of 113856381 is 183658311.

113856381 is a `hidden beast` number, since 1 + 13 + 8 + 5 + 638 + 1 = 666.

It is not a de Polignac number, because 113856381 - 2³ = 113856373 is a prime.

It is a super-2 number, since 2×113856381² = 25926550988834322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113856311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27780 + ... + 31613.

It is an arithmetic number, because the mean of its divisors is an integer number (10690920).

Almost surely, 2^113856381 is an apocalyptic number.

It is an amenable number.

113856381 is a deficient number, since it is larger than the sum of its proper divisors (57198339).

113856381 is an equidigital number, since it uses as much as digits as its factorization.

113856381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59473 (or 59467 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 113856381 is about 10670.3505565656. The cubic root of 113856381 is about 484.6770528709.

It can be divided in two parts, 11385 and 6381, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 113856381 in words is "one hundred thirteen million, eight hundred fifty-six thousand, three hundred eighty-one".