40315631 has 2 divisors, whose sum is σ = 40315632. Its totient is φ = 40315630.

The previous prime is 40315591. The next prime is 40315657. The reversal of 40315631 is 13651304.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40315631 - 2¹⁸ = 40053487 is a prime.

It is a super-2 number, since 2×40315631² = 3250700205856322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40315597 and 40315606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40315661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20157815 + 20157816.

It is an arithmetic number, because the mean of its divisors is an integer number (20157816).

Almost surely, 2^40315631 is an apocalyptic number.

40315631 is a deficient number, since it is larger than the sum of its proper divisors (1).

40315631 is an equidigital number, since it uses as much as digits as its factorization.

40315631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 40315631 is about 6349.4591108220. The cubic root of 40315631 is about 342.8923693386.

Adding to 40315631 its reverse (13651304), we get a palindrome (53966935).

The spelling of 40315631 in words is "forty million, three hundred fifteen thousand, six hundred thirty-one".