312505513 has 4 divisors (see below), whose sum is σ = 322586368. Its totient is φ = 302424660.

The previous prime is 312505493. The next prime is 312505519. The reversal of 312505513 is 315505213.

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 312505513 - 2¹⁷ = 312374441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312505519) 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, 5040381 + ... + 5040442.

It is an arithmetic number, because the mean of its divisors is an integer number (80646592).

Almost surely, 2^312505513 is an apocalyptic number.

It is an amenable number.

312505513 is a deficient number, since it is larger than the sum of its proper divisors (10080855).

312505513 is a wasteful number, since it uses less digits than its factorization.

312505513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10080854.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 312505513 is about 17677.8254601634. The cubic root of 312505513 is about 678.6083946811.

It can be divided in two parts, 31250 and 5513, that added together give a palindrome (36763).

The spelling of 312505513 in words is "three hundred twelve million, five hundred five thousand, five hundred thirteen".