312115513 has 4 divisors (see below), whose sum is σ = 313302528. Its totient is φ = 310928500.

The previous prime is 312115511. The next prime is 312115577. The reversal of 312115513 is 315511213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 312115513 - 2¹ = 312115511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312115511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 593113 + ... + 593638.

It is an arithmetic number, because the mean of its divisors is an integer number (78325632).

Almost surely, 2^312115513 is an apocalyptic number.

It is an amenable number.

312115513 is a deficient number, since it is larger than the sum of its proper divisors (1187015).

312115513 is a wasteful number, since it uses less digits than its factorization.

312115513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187014.

The product of its digits is 450, while the sum is 22.

The square root of 312115513 is about 17666.7912479884. The cubic root of 312115513 is about 678.3259810544.

Adding to 312115513 its reverse (315511213), we get a palindrome (627626726).

The spelling of 312115513 in words is "three hundred twelve million, one hundred fifteen thousand, five hundred thirteen".