312320513 has 4 divisors (see below), whose sum is σ = 313938948. Its totient is φ = 310702080.

The previous prime is 312320507. The next prime is 312320527. The reversal of 312320513 is 315023213.

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 21003889 + 291316624 = 4583^2 + 17068^2 .

It is a cyclic number.

It is not a de Polignac number, because 312320513 - 2²⁰ = 311271937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312320543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808928 + ... + 809313.

It is an arithmetic number, because the mean of its divisors is an integer number (78484737).

Almost surely, 2^312320513 is an apocalyptic number.

It is an amenable number.

312320513 is a deficient number, since it is larger than the sum of its proper divisors (1618435).

312320513 is a wasteful number, since it uses less digits than its factorization.

312320513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618434.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 312320513 is about 17672.5921415054. The cubic root of 312320513 is about 678.4744585538.

Adding to 312320513 its reverse (315023213), we get a palindrome (627343726).

The spelling of 312320513 in words is "three hundred twelve million, three hundred twenty thousand, five hundred thirteen".