31234513 has 2 divisors, whose sum is σ = 31234514. Its totient is φ = 31234512.

The previous prime is 31234481. The next prime is 31234517. The reversal of 31234513 is 31543213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28217344 + 3017169 = 5312^2 + 1737^2 .

It is a cyclic number.

It is not a de Polignac number, because 31234513 - 2⁵ = 31234481 is a prime.

It is not a weakly prime, because it can be changed into another prime (31234517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15617256 + 15617257.

It is an arithmetic number, because the mean of its divisors is an integer number (15617257).

Almost surely, 2^31234513 is an apocalyptic number.

It is an amenable number.

31234513 is a deficient number, since it is larger than the sum of its proper divisors (1).

31234513 is an equidigital number, since it uses as much as digits as its factorization.

31234513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 22.

The square root of 31234513 is about 5588.7845726956. The cubic root of 31234513 is about 314.9282208163.

Adding to 31234513 its reverse (31543213), we get a palindrome (62777726).

The spelling of 31234513 in words is "thirty-one million, two hundred thirty-four thousand, five hundred thirteen".