31140631 has 2 divisors, whose sum is σ = 31140632. Its totient is φ = 31140630.

The previous prime is 31140611. The next prime is 31140673. The reversal of 31140631 is 13604113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31140631 - 2⁷ = 31140503 is a prime.

It is a super-2 number, since 2×31140631² = 1939477798156322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31140599 and 31140608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31140611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15570315 + 15570316.

It is an arithmetic number, because the mean of its divisors is an integer number (15570316).

Almost surely, 2^31140631 is an apocalyptic number.

31140631 is a deficient number, since it is larger than the sum of its proper divisors (1).

31140631 is an equidigital number, since it uses as much as digits as its factorization.

31140631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 31140631 is about 5580.3791089853. The cubic root of 31140631 is about 314.6123761480.

Adding to 31140631 its reverse (13604113), we get a palindrome (44744744).

The spelling of 31140631 in words is "thirty-one million, one hundred forty thousand, six hundred thirty-one".