312108688649 has 4 divisors (see below), whose sum is σ = 312111356820. Its totient is φ = 312106020480.

The previous prime is 312108688621. The next prime is 312108688657. The reversal of 312108688649 is 946886801213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946886801213 = 31 ⋅30544735523.

It can be written as a sum of positive squares in 2 ways, for example, as 89098071049 + 223010617600 = 298493^2 + 472240^2 .

It is a cyclic number.

It is not a de Polignac number, because 312108688649 - 2⁸ = 312108688393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312108688594 and 312108688603.

It is not an unprimeable number, because it can be changed into a prime (312108688049) 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, 1150172 + ... + 1395389.

It is an arithmetic number, because the mean of its divisors is an integer number (78027839205).

Almost surely, 2^312108688649 is an apocalyptic number.

It is an amenable number.

312108688649 is a deficient number, since it is larger than the sum of its proper divisors (2668171).

312108688649 is a wasteful number, since it uses less digits than its factorization.

312108688649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2668170.

The product of its (nonzero) digits is 3981312, while the sum is 56.

The spelling of 312108688649 in words is "three hundred twelve billion, one hundred eight million, six hundred eighty-eight thousand, six hundred forty-nine".