40131731 has 2 divisors, whose sum is σ = 40131732. Its totient is φ = 40131730.

The previous prime is 40131709. The next prime is 40131761. The reversal of 40131731 is 13713104.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40131731 - 2¹⁴ = 40115347 is a prime.

It is a super-2 number, since 2×40131731² = 3221111666112722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40131761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20065865 + 20065866.

It is an arithmetic number, because the mean of its divisors is an integer number (20065866).

Almost surely, 2^40131731 is an apocalyptic number.

40131731 is a deficient number, since it is larger than the sum of its proper divisors (1).

40131731 is an equidigital number, since it uses as much as digits as its factorization.

40131731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 40131731 is about 6334.9610101405. The cubic root of 40131731 is about 342.3702060275.

Adding to 40131731 its reverse (13713104), we get a palindrome (53844835).

The spelling of 40131731 in words is "forty million, one hundred thirty-one thousand, seven hundred thirty-one".