313041656621 has 2 divisors, whose sum is σ = 313041656622. Its totient is φ = 313041656620.

The previous prime is 313041656591. The next prime is 313041656639. The reversal of 313041656621 is 126656140313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240898382596 + 72143274025 = 490814^2 + 268595^2 .

It is an emirp because it is prime and its reverse (126656140313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313041656621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313041656651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156520828310 + 156520828311.

It is an arithmetic number, because the mean of its divisors is an integer number (156520828311).

Almost surely, 2^313041656621 is an apocalyptic number.

It is an amenable number.

313041656621 is a deficient number, since it is larger than the sum of its proper divisors (1).

313041656621 is an equidigital number, since it uses as much as digits as its factorization.

313041656621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

Adding to 313041656621 its reverse (126656140313), we get a palindrome (439697796934).

The spelling of 313041656621 in words is "three hundred thirteen billion, forty-one million, six hundred fifty-six thousand, six hundred twenty-one".