31612013 has 2 divisors, whose sum is σ = 31612014. Its totient is φ = 31612012.

The previous prime is 31611997. The next prime is 31612043. The reversal of 31612013 is 31021613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16104169 + 15507844 = 4013^2 + 3938^2 .

It is a cyclic number.

It is not a de Polignac number, because 31612013 - 2⁴ = 31611997 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31611982 and 31612000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31612043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15806006 + 15806007.

It is an arithmetic number, because the mean of its divisors is an integer number (15806007).

Almost surely, 2^31612013 is an apocalyptic number.

It is an amenable number.

31612013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31612013 is an equidigital number, since it uses as much as digits as its factorization.

31612013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 31612013 is about 5622.4561358894. The cubic root of 31612013 is about 316.1918832731.

Adding to 31612013 its reverse (31021613), we get a palindrome (62633626).

The spelling of 31612013 in words is "thirty-one million, six hundred twelve thousand, thirteen".