31612513 has 2 divisors, whose sum is σ = 31612514. Its totient is φ = 31612512.

The previous prime is 31612487. The next prime is 31612531. The reversal of 31612513 is 31521613.

It is a happy number.

Together with next prime (31612531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24088464 + 7524049 = 4908^2 + 2743^2 .

It is a cyclic number.

It is not a de Polignac number, because 31612513 - 2⁵ = 31612481 is a prime.

It is not a weakly prime, because it can be changed into another prime (31612573) 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 as a sum of consecutive naturals, namely, 15806256 + 15806257.

It is an arithmetic number, because the mean of its divisors is an integer number (15806257).

Almost surely, 2^31612513 is an apocalyptic number.

It is an amenable number.

31612513 is a deficient number, since it is larger than the sum of its proper divisors (1).

31612513 is an equidigital number, since it uses as much as digits as its factorization.

31612513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 22.

The square root of 31612513 is about 5622.5006002668. The cubic root of 31612513 is about 316.1935503092.

The spelling of 31612513 in words is "thirty-one million, six hundred twelve thousand, five hundred thirteen".