31315393 has 2 divisors, whose sum is σ = 31315394. Its totient is φ = 31315392.

The previous prime is 31315381. The next prime is 31315423. The reversal of 31315393 is 39351313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23736384 + 7579009 = 4872^2 + 2753^2 .

It is a cyclic number.

It is not a de Polignac number, because 31315393 - 2¹³ = 31307201 is a prime.

It is not a weakly prime, because it can be changed into another prime (31315303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15657696 + 15657697.

It is an arithmetic number, because the mean of its divisors is an integer number (15657697).

Almost surely, 2^31315393 is an apocalyptic number.

It is an amenable number.

31315393 is a deficient number, since it is larger than the sum of its proper divisors (1).

31315393 is an equidigital number, since it uses as much as digits as its factorization.

31315393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3645, while the sum is 28.

The square root of 31315393 is about 5596.0158148454. The cubic root of 31315393 is about 315.1998161132.

The spelling of 31315393 in words is "thirty-one million, three hundred fifteen thousand, three hundred ninety-three".