31623466255621 has 2 divisors, whose sum is σ = 31623466255622. Its totient is φ = 31623466255620.

The previous prime is 31623466255559. The next prime is 31623466255631. The reversal of 31623466255621 is 12655266432613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22022231056225 + 9601235199396 = 4692785^2 + 3098586^2 .

It is a cyclic number.

It is not a de Polignac number, because 31623466255621 - 2⁹ = 31623466255109 is a prime.

It is a super-2 number, since 2×31623466255621² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31623466255631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15811733127810 + 15811733127811.

It is an arithmetic number, because the mean of its divisors is an integer number (15811733127811).

Almost surely, 2^{31623466255621} is an apocalyptic number.

It is an amenable number.

31623466255621 is a deficient number, since it is larger than the sum of its proper divisors (1).

31623466255621 is an equidigital number, since it uses as much as digits as its factorization.

31623466255621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9331200, while the sum is 52.

The spelling of 31623466255621 in words is "thirty-one trillion, six hundred twenty-three billion, four hundred sixty-six million, two hundred fifty-five thousand, six hundred twenty-one".