312103513 has 4 divisors (see below), whose sum is σ = 312882228. Its totient is φ = 311324800.

The previous prime is 312103501. The next prime is 312103577. The reversal of 312103513 is 315301213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 225390169 + 86713344 = 15013^2 + 9312^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312103513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312103213) 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 in 3 ways as a sum of consecutive naturals, for example, 388756 + ... + 389557.

It is an arithmetic number, because the mean of its divisors is an integer number (78220557).

Almost surely, 2^312103513 is an apocalyptic number.

It is an amenable number.

312103513 is a deficient number, since it is larger than the sum of its proper divisors (778715).

312103513 is an equidigital number, since it uses as much as digits as its factorization.

312103513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778714.

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

The square root of 312103513 is about 17666.4516244774. The cubic root of 312103513 is about 678.3172876746.

Adding to 312103513 its reverse (315301213), we get a palindrome (627404726).

The spelling of 312103513 in words is "three hundred twelve million, one hundred three thousand, five hundred thirteen".