312131513 has 2 divisors, whose sum is σ = 312131514. Its totient is φ = 312131512.

The previous prime is 312131503. The next prime is 312131531. The reversal of 312131513 is 315131213.

Together with next prime (312131531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180983209 + 131148304 = 13453^2 + 11452^2 .

It is a cyclic number.

It is not a de Polignac number, because 312131513 - 2⁴ = 312131497 is a prime.

It is not a weakly prime, because it can be changed into another prime (312131503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156065756 + 156065757.

It is an arithmetic number, because the mean of its divisors is an integer number (156065757).

Almost surely, 2^312131513 is an apocalyptic number.

It is an amenable number.

312131513 is a deficient number, since it is larger than the sum of its proper divisors (1).

312131513 is an equidigital number, since it uses as much as digits as its factorization.

312131513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 20.

The square root of 312131513 is about 17667.2440691807. The cubic root of 312131513 is about 678.3375718809.

Adding to 312131513 its reverse (315131213), we get a palindrome (627262726).

The spelling of 312131513 in words is "three hundred twelve million, one hundred thirty-one thousand, five hundred thirteen".