23631381 has 24 divisors (see below), whose sum is σ = 35212320. Its totient is φ = 15263136.

The previous prime is 23631379. The next prime is 23631389. The reversal of 23631381 is 18313632.

It is a happy number.

23631381 is a `hidden beast` number, since 23 + 631 + 3 + 8 + 1 = 666.

It is not a de Polignac number, because 23631381 - 2¹ = 23631379 is a prime.

It is a super-2 number, since 2×23631381² = 1116884335934322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23631389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87715 + ... + 87983.

It is an arithmetic number, because the mean of its divisors is an integer number (1467180).

Almost surely, 2^23631381 is an apocalyptic number.

It is an amenable number.

23631381 is a deficient number, since it is larger than the sum of its proper divisors (11580939).

23631381 is a wasteful number, since it uses less digits than its factorization.

23631381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 542 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 23631381 is about 4861.2118859396. The cubic root of 23631381 is about 286.9655087705.

The spelling of 23631381 in words is "twenty-three million, six hundred thirty-one thousand, three hundred eighty-one".