313759667621 has 2 divisors, whose sum is σ = 313759667622. Its totient is φ = 313759667620.

The previous prime is 313759667587. The next prime is 313759667657. The reversal of 313759667621 is 126766957313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208109316100 + 105650351521 = 456190^2 + 325039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313759667621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313759663621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156879833810 + 156879833811.

It is an arithmetic number, because the mean of its divisors is an integer number (156879833811).

Almost surely, 2^313759667621 is an apocalyptic number.

It is an amenable number.

313759667621 is a deficient number, since it is larger than the sum of its proper divisors (1).

313759667621 is an equidigital number, since it uses as much as digits as its factorization.

313759667621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8573040, while the sum is 56.

The spelling of 313759667621 in words is "three hundred thirteen billion, seven hundred fifty-nine million, six hundred sixty-seven thousand, six hundred twenty-one".