31630745 has 12 divisors (see below), whose sum is σ = 39018924. Its totient is φ = 24615360.

The previous prime is 31630741. The next prime is 31630751. The reversal of 31630745 is 54703613.

It can be written as a sum of positive squares in 6 ways, for example, as 3125824 + 28504921 = 1768^2 + 5339^2 .

It is not a de Polignac number, because 31630745 - 2² = 31630741 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31630741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4535 + ... + 9155.

It is an arithmetic number, because the mean of its divisors is an integer number (3251577).

Almost surely, 2^31630745 is an apocalyptic number.

It is an amenable number.

31630745 is a deficient number, since it is larger than the sum of its proper divisors (7388179).

31630745 is an equidigital number, since it uses as much as digits as its factorization.

31630745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4700 (or 4663 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 31630745 is about 5624.1217092094. The cubic root of 31630745 is about 316.2543251139.

The spelling of 31630745 in words is "thirty-one million, six hundred thirty thousand, seven hundred forty-five".