312920278613 has 4 divisors (see below), whose sum is σ = 318050119308. Its totient is φ = 307790437920.

The previous prime is 312920278591. The next prime is 312920278663. The reversal of 312920278613 is 316872029213.

It is a happy number.

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 54020450929 + 258899827684 = 232423^2 + 508822^2 .

It is a cyclic number.

It is not a de Polignac number, because 312920278613 - 2¹² = 312920274517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312920278663) 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, 2564920256 + ... + 2564920377.

It is an arithmetic number, because the mean of its divisors is an integer number (79512529827).

Almost surely, 2^312920278613 is an apocalyptic number.

It is an amenable number.

312920278613 is a deficient number, since it is larger than the sum of its proper divisors (5129840695).

312920278613 is an equidigital number, since it uses as much as digits as its factorization.

312920278613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129840694.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 312920278613 in words is "three hundred twelve billion, nine hundred twenty million, two hundred seventy-eight thousand, six hundred thirteen".