40520131 has 4 divisors (see below), whose sum is σ = 41827264. Its totient is φ = 39213000.

The previous prime is 40520111. The next prime is 40520149. The reversal of 40520131 is 13102504.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40520131 is a prime.

It is a super-2 number, since 2×40520131² = 3283762032514322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40520111) 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, 653520 + ... + 653581.

It is an arithmetic number, because the mean of its divisors is an integer number (10456816).

Almost surely, 2^40520131 is an apocalyptic number.

40520131 is a deficient number, since it is larger than the sum of its proper divisors (1307133).

40520131 is a wasteful number, since it uses less digits than its factorization.

40520131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307132.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 40520131 is about 6365.5424749192. The cubic root of 40520131 is about 343.4711627051.

Adding to 40520131 its reverse (13102504), we get a palindrome (53622635).

The spelling of 40520131 in words is "forty million, five hundred twenty thousand, one hundred thirty-one".