313978881991 has 4 divisors (see below), whose sum is σ = 314266146472. Its totient is φ = 313691617512.

The previous prime is 313978881977. The next prime is 313978882003. The reversal of 313978881991 is 199188879313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 313978881991 - 2⁵ = 313978881959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313978881911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143630601 + ... + 143632786.

It is an arithmetic number, because the mean of its divisors is an integer number (78566536618).

Almost surely, 2^313978881991 is an apocalyptic number.

313978881991 is a deficient number, since it is larger than the sum of its proper divisors (287264481).

313978881991 is a wasteful number, since it uses less digits than its factorization.

313978881991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287264480.

The product of its digits is 23514624, while the sum is 67.

The spelling of 313978881991 in words is "three hundred thirteen billion, nine hundred seventy-eight million, eight hundred eighty-one thousand, nine hundred ninety-one".