31116952621 has 2 divisors, whose sum is σ = 31116952622. Its totient is φ = 31116952620.

The previous prime is 31116952591. The next prime is 31116952639. The reversal of 31116952621 is 12625961113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30945735396 + 171217225 = 175914^2 + 13085^2 .

It is a cyclic number.

It is not a de Polignac number, because 31116952621 - 2¹⁵ = 31116919853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31116952651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15558476310 + 15558476311.

It is an arithmetic number, because the mean of its divisors is an integer number (15558476311).

Almost surely, 2^31116952621 is an apocalyptic number.

It is an amenable number.

31116952621 is a deficient number, since it is larger than the sum of its proper divisors (1).

31116952621 is an equidigital number, since it uses as much as digits as its factorization.

31116952621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The spelling of 31116952621 in words is "thirty-one billion, one hundred sixteen million, nine hundred fifty-two thousand, six hundred twenty-one".