40317631 has 2 divisors, whose sum is σ = 40317632. Its totient is φ = 40317630.

The previous prime is 40317619. The next prime is 40317647. The reversal of 40317631 is 13671304.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40317631 - 2⁷ = 40317503 is a prime.

It is a super-2 number, since 2×40317631² = 3251022738904322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40317596 and 40317605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40317611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20158815 + 20158816.

It is an arithmetic number, because the mean of its divisors is an integer number (20158816).

Almost surely, 2^40317631 is an apocalyptic number.

40317631 is a deficient number, since it is larger than the sum of its proper divisors (1).

40317631 is an equidigital number, since it uses as much as digits as its factorization.

40317631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 40317631 is about 6349.6166025989. The cubic root of 40317631 is about 342.8980393759.

Adding to 40317631 its reverse (13671304), we get a palindrome (53988935).

The spelling of 40317631 in words is "forty million, three hundred seventeen thousand, six hundred thirty-one".