312031513 has 2 divisors, whose sum is σ = 312031514. Its totient is φ = 312031512.

The previous prime is 312031483. The next prime is 312031519. The reversal of 312031513 is 315130213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167262489 + 144769024 = 12933^2 + 12032^2 .

It is an emirp because it is prime and its reverse (315130213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312031513 - 2¹⁷ = 311900441 is a prime.

It is not a weakly prime, because it can be changed into another prime (312031519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156015756 + 156015757.

It is an arithmetic number, because the mean of its divisors is an integer number (156015757).

Almost surely, 2^312031513 is an apocalyptic number.

It is an amenable number.

312031513 is a deficient number, since it is larger than the sum of its proper divisors (1).

312031513 is an equidigital number, since it uses as much as digits as its factorization.

312031513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 312031513 is about 17664.4137462866. The cubic root of 312031513 is about 678.2651227157.

Adding to 312031513 its reverse (315130213), we get a palindrome (627161726).

The spelling of 312031513 in words is "three hundred twelve million, thirty-one thousand, five hundred thirteen".