31303913 has 2 divisors, whose sum is σ = 31303914. Its totient is φ = 31303912.

The previous prime is 31303907. The next prime is 31303931. The reversal of 31303913 is 31930313.

Together with next prime (31303931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23396569 + 7907344 = 4837^2 + 2812^2 .

It is a cyclic number.

It is not a de Polignac number, because 31303913 - 2²² = 27109609 is a prime.

It is a super-2 number, since 2×31303913² = 1959869938223138, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31303903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15651956 + 15651957.

It is an arithmetic number, because the mean of its divisors is an integer number (15651957).

Almost surely, 2^31303913 is an apocalyptic number.

It is an amenable number.

31303913 is a deficient number, since it is larger than the sum of its proper divisors (1).

31303913 is an equidigital number, since it uses as much as digits as its factorization.

31303913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 23.

The square root of 31303913 is about 5594.9899910545. The cubic root of 31303913 is about 315.1612947365.

The spelling of 31303913 in words is "thirty-one million, three hundred three thousand, nine hundred thirteen".