3117252831221 has 2 divisors, whose sum is σ = 3117252831222. Its totient is φ = 3117252831220.

The previous prime is 3117252831053. The next prime is 3117252831223. The reversal of 3117252831221 is 1221382527113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3107499096100 + 9753735121 = 1762810^2 + 98761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3117252831221 is a prime.

Together with 3117252831223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3117252831223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1558626415610 + 1558626415611.

It is an arithmetic number, because the mean of its divisors is an integer number (1558626415611).

Almost surely, 2^{3117252831221} is an apocalyptic number.

It is an amenable number.

3117252831221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3117252831221 is an equidigital number, since it uses as much as digits as its factorization.

3117252831221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The spelling of 3117252831221 in words is "three trillion, one hundred seventeen billion, two hundred fifty-two million, eight hundred thirty-one thousand, two hundred twenty-one".