30631313 has 2 divisors, whose sum is σ = 30631314. Its totient is φ = 30631312.

The previous prime is 30631309. The next prime is 30631319. The reversal of 30631313 is 31313603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30393169 + 238144 = 5513^2 + 488^2 .

It is a cyclic number.

It is not a de Polignac number, because 30631313 - 2² = 30631309 is a prime.

It is a super-2 number, since 2×30631313² = 1876554672207938, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30631319) 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, 15315656 + 15315657.

It is an arithmetic number, because the mean of its divisors is an integer number (15315657).

Almost surely, 2^30631313 is an apocalyptic number.

It is an amenable number.

30631313 is a deficient number, since it is larger than the sum of its proper divisors (1).

30631313 is an equidigital number, since it uses as much as digits as its factorization.

30631313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 20.

The square root of 30631313 is about 5534.5562604422. The cubic root of 30631313 is about 312.8877337611.

Adding to 30631313 its reverse (31313603), we get a palindrome (61944916).

The spelling of 30631313 in words is "thirty million, six hundred thirty-one thousand, three hundred thirteen".