31261253324621 has 2 divisors, whose sum is σ = 31261253324622. Its totient is φ = 31261253324620.

The previous prime is 31261253324599. The next prime is 31261253324677. The reversal of 31261253324621 is 12642335216213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20134192048996 + 11127061275625 = 4487114^2 + 3335725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31261253324621 is a prime.

It is a super-2 number, since 2×31261253324621² (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 (31261253524621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15630626662310 + 15630626662311.

It is an arithmetic number, because the mean of its divisors is an integer number (15630626662311).

Almost surely, 2^{31261253324621} is an apocalyptic number.

It is an amenable number.

31261253324621 is a deficient number, since it is larger than the sum of its proper divisors (1).

31261253324621 is an equidigital number, since it uses as much as digits as its factorization.

31261253324621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 41.

The spelling of 31261253324621 in words is "thirty-one trillion, two hundred sixty-one billion, two hundred fifty-three million, three hundred twenty-four thousand, six hundred twenty-one".