31648313 has 2 divisors, whose sum is σ = 31648314. Its totient is φ = 31648312.

The previous prime is 31648307. The next prime is 31648381. The reversal of 31648313 is 31384613.

31648313 is nontrivially palindromic in base 8.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30118144 + 1530169 = 5488^2 + 1237^2 .

It is a cyclic number.

It is not a de Polignac number, because 31648313 - 2⁴ = 31648297 is a prime.

It is not a weakly prime, because it can be changed into another prime (31642313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15824156 + 15824157.

It is an arithmetic number, because the mean of its divisors is an integer number (15824157).

Almost surely, 2^31648313 is an apocalyptic number.

It is an amenable number.

31648313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31648313 is an equidigital number, since it uses as much as digits as its factorization.

31648313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 31648313 is about 5625.6833362712. The cubic root of 31648313 is about 316.3128644421.

The spelling of 31648313 in words is "thirty-one million, six hundred forty-eight thousand, three hundred thirteen".