313212451551581 has 2 divisors, whose sum is σ = 313212451551582. Its totient is φ = 313212451551580.

The previous prime is 313212451551521. The next prime is 313212451551613. The reversal of 313212451551581 is 185155154212313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295692442404100 + 17520009147481 = 17195710^2 + 4185691^2 .

It is a cyclic number.

It is not a de Polignac number, because 313212451551581 - 2¹⁴ = 313212451535197 is a prime.

It is a super-2 number, since 2×313212451551581² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313212451551521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156606225775790 + 156606225775791.

It is an arithmetic number, because the mean of its divisors is an integer number (156606225775791).

Almost surely, 2^{313212451551581} is an apocalyptic number.

It is an amenable number.

313212451551581 is a deficient number, since it is larger than the sum of its proper divisors (1).

313212451551581 is an equidigital number, since it uses as much as digits as its factorization.

313212451551581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720000, while the sum is 47.

The spelling of 313212451551581 in words is "three hundred thirteen trillion, two hundred twelve billion, four hundred fifty-one million, five hundred fifty-one thousand, five hundred eighty-one".