40131 has 24 divisors (see below), whose sum is σ = 72800. Its totient is φ = 21168.

The previous prime is 40129. The next prime is 40151. The reversal of 40131 is 13104.

40131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40131 - 2¹ = 40129 is a prime.

It is a super-2 number, since 2×40131² = 3220994322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (40111) 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, 3081 + ... + 3093.

2⁴⁰¹³¹ is an apocalyptic number.

40131 is a deficient number, since it is larger than the sum of its proper divisors (32669).

40131 is a wasteful number, since it uses less digits than its factorization.

40131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 40131 is about 200.3272322976. The cubic root of 40131 is about 34.2368127256.

Adding to 40131 its reverse (13104), we get a palindrome (53235).

Multiplying 40131 by its reverse (13104), we get a square (525876624 = 22932²).

It can be divided in two parts, 40 and 131, that added together give a palindrome (171).

The spelling of 40131 in words is "forty thousand, one hundred thirty-one".