312440513 has 18 divisors (see below), whose sum is σ = 399503538. Its totient is φ = 243455520.

The previous prime is 312440489. The next prime is 312440539. The reversal of 312440513 is 315044213.

It can be written as a sum of positive squares in only one way, i.e., 310922689 + 1517824 = 17633^2 + 1232^2 .

It is not a de Polignac number, because 312440513 - 2⁶ = 312440449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (312440563) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 20420 + ... + 32277.

It is an arithmetic number, because the mean of its divisors is an integer number (22194641).

Almost surely, 2^312440513 is an apocalyptic number.

It is an amenable number.

312440513 is a deficient number, since it is larger than the sum of its proper divisors (87063025).

312440513 is a wasteful number, since it uses less digits than its factorization.

312440513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52733 (or 52715 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 312440513 is about 17675.9869031407. The cubic root of 312440513 is about 678.5613420667.

Adding to 312440513 its reverse (315044213), we get a palindrome (627484726).

The spelling of 312440513 in words is "three hundred twelve million, four hundred forty thousand, five hundred thirteen".