313879905421 has 2 divisors, whose sum is σ = 313879905422. Its totient is φ = 313879905420.

The previous prime is 313879905397. The next prime is 313879905431. The reversal of 313879905421 is 124509978313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313320062500 + 559842921 = 559750^2 + 23661^2 .

It is a cyclic number.

It is not a de Polignac number, because 313879905421 - 2⁵ = 313879905389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313879905431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156939952710 + 156939952711.

It is an arithmetic number, because the mean of its divisors is an integer number (156939952711).

Almost surely, 2^313879905421 is an apocalyptic number.

It is an amenable number.

313879905421 is a deficient number, since it is larger than the sum of its proper divisors (1).

313879905421 is an equidigital number, since it uses as much as digits as its factorization.

313879905421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 313879905421 in words is "three hundred thirteen billion, eight hundred seventy-nine million, nine hundred five thousand, four hundred twenty-one".