31028713 has 2 divisors, whose sum is σ = 31028714. Its totient is φ = 31028712.

The previous prime is 31028707. The next prime is 31028717. The reversal of 31028713 is 31782013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29888089 + 1140624 = 5467^2 + 1068^2 .

It is an emirp because it is prime and its reverse (31782013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31028713 - 2⁹ = 31028201 is a prime.

It is not a weakly prime, because it can be changed into another prime (31028717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15514356 + 15514357.

It is an arithmetic number, because the mean of its divisors is an integer number (15514357).

Almost surely, 2^31028713 is an apocalyptic number.

It is an amenable number.

31028713 is a deficient number, since it is larger than the sum of its proper divisors (1).

31028713 is an equidigital number, since it uses as much as digits as its factorization.

31028713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 31028713 is about 5570.3422695558. The cubic root of 31028713 is about 314.2350229047.

The spelling of 31028713 in words is "thirty-one million, twenty-eight thousand, seven hundred thirteen".