31011313 has 2 divisors, whose sum is σ = 31011314. Its totient is φ = 31011312.

The previous prime is 31011311. The next prime is 31011319. The reversal of 31011313 is 31311013.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19607184 + 11404129 = 4428^2 + 3377^2 .

It is a cyclic number.

It is not a de Polignac number, because 31011313 - 2¹ = 31011311 is a prime.

Together with 31011311, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31011293 and 31011302.

It is not a weakly prime, because it can be changed into another prime (31011311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15505656 + 15505657.

It is an arithmetic number, because the mean of its divisors is an integer number (15505657).

Almost surely, 2^31011313 is an apocalyptic number.

It is an amenable number.

31011313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31011313 is an equidigital number, since it uses as much as digits as its factorization.

31011313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 31011313 is about 5568.7802075499. The cubic root of 31011313 is about 314.1762739672.

Adding to 31011313 its reverse (31311013), we get a palindrome (62322326).

The spelling of 31011313 in words is "thirty-one million, eleven thousand, three hundred thirteen".