312305513 has 4 divisors (see below), whose sum is σ = 336329028. Its totient is φ = 288282000.

The previous prime is 312305491. The next prime is 312305519. The reversal of 312305513 is 315503213.

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 47169424 + 265136089 = 6868^2 + 16283^2 .

It is a cyclic number.

It is not a de Polignac number, because 312305513 - 2²⁶ = 245196649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312305519) 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, 12011738 + ... + 12011763.

It is an arithmetic number, because the mean of its divisors is an integer number (84082257).

Almost surely, 2^312305513 is an apocalyptic number.

It is an amenable number.

312305513 is a deficient number, since it is larger than the sum of its proper divisors (24023515).

312305513 is a wasteful number, since it uses less digits than its factorization.

312305513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24023514.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 312305513 is about 17672.1677504487. The cubic root of 312305513 is about 678.4635965500.

Adding to 312305513 its reverse (315503213), we get a palindrome (627808726).

The spelling of 312305513 in words is "three hundred twelve million, three hundred five thousand, five hundred thirteen".