40013131 has 4 divisors (see below), whose sum is σ = 40401712. Its totient is φ = 39624552.

The previous prime is 40013117. The next prime is 40013153. The reversal of 40013131 is 13131004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40013131 - 2¹⁵ = 39980363 is a prime.

It is a super-2 number, since 2×40013131² = 3202101304846322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40013111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194136 + ... + 194341.

It is an arithmetic number, because the mean of its divisors is an integer number (10100428).

Almost surely, 2^40013131 is an apocalyptic number.

40013131 is a deficient number, since it is larger than the sum of its proper divisors (388581).

40013131 is a wasteful number, since it uses less digits than its factorization.

40013131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388580.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 40013131 is about 6325.5933318543. The cubic root of 40013131 is about 342.0326080647.

Adding to 40013131 its reverse (13131004), we get a palindrome (53144135).

It can be divided in two parts, 400 and 13131, that added together give a palindrome (13531).

The spelling of 40013131 in words is "forty million, thirteen thousand, one hundred thirty-one".