31324313 has 2 divisors, whose sum is σ = 31324314. Its totient is φ = 31324312.

The previous prime is 31324303. The next prime is 31324333. The reversal of 31324313 is 31342313.

It is an a-pointer prime, because the next prime (31324333) can be obtained adding 31324313 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19784704 + 11539609 = 4448^2 + 3397^2 .

It is a cyclic number.

It is not a de Polignac number, because 31324313 - 2⁴ = 31324297 is a prime.

It is not a weakly prime, because it can be changed into another prime (31324303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15662156 + 15662157.

It is an arithmetic number, because the mean of its divisors is an integer number (15662157).

Almost surely, 2^31324313 is an apocalyptic number.

It is an amenable number.

31324313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31324313 is an equidigital number, since it uses as much as digits as its factorization.

31324313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 20.

The square root of 31324313 is about 5596.8127537019. The cubic root of 31324313 is about 315.2297408582.

Adding to 31324313 its reverse (31342313), we get a palindrome (62666626).

The spelling of 31324313 in words is "thirty-one million, three hundred twenty-four thousand, three hundred thirteen".