31126326654161 has 2 divisors, whose sum is σ = 31126326654162. Its totient is φ = 31126326654160.

The previous prime is 31126326654151. The next prime is 31126326654223. The reversal of 31126326654161 is 16145662362113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30167072911936 + 959253742225 = 5492456^2 + 979415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31126326654161 is a prime.

It is a super-2 number, since 2×31126326654161² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31126326654151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15563163327080 + 15563163327081.

It is an arithmetic number, because the mean of its divisors is an integer number (15563163327081).

Almost surely, 2^{31126326654161} is an apocalyptic number.

It is an amenable number.

31126326654161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31126326654161 is an equidigital number, since it uses as much as digits as its factorization.

31126326654161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 47.

The spelling of 31126326654161 in words is "thirty-one trillion, one hundred twenty-six billion, three hundred twenty-six million, six hundred fifty-four thousand, one hundred sixty-one".