36231381 has 20 divisors (see below), whose sum is σ = 54293184. Its totient is φ = 24078600.

The previous prime is 36231379. The next prime is 36231421. The reversal of 36231381 is 18313263.

It is a happy number.

36231381 is a `hidden beast` number, since 3 + 623 + 1 + 38 + 1 = 666.

It is not a de Polignac number, because 36231381 - 2¹ = 36231379 is a prime.

It is a super-2 number, since 2×36231381² = 2625425938334322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36231581) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 39316 + ... + 40226.

Almost surely, 2^36231381 is an apocalyptic number.

It is an amenable number.

36231381 is a deficient number, since it is larger than the sum of its proper divisors (18061803).

36231381 is an equidigital number, since it uses as much as digits as its factorization.

36231381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414 (or 1405 counting only the distinct ones).

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

The square root of 36231381 is about 6019.2508670099. The cubic root of 36231381 is about 330.8986251072.

The spelling of 36231381 in words is "thirty-six million, two hundred thirty-one thousand, three hundred eighty-one".