31423645621169 has 2 divisors, whose sum is σ = 31423645621170. Its totient is φ = 31423645621168.

The previous prime is 31423645621133. The next prime is 31423645621177. The reversal of 31423645621169 is 96112654632413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25140075664144 + 6283569957025 = 5013988^2 + 2506705^2 .

It is a cyclic number.

It is not a de Polignac number, because 31423645621169 - 2³⁶ = 31354926144433 is a prime.

It is a super-2 number, since 2×31423645621169² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31423645621169.

It is not a weakly prime, because it can be changed into another prime (31423645651169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711822810584 + 15711822810585.

It is an arithmetic number, because the mean of its divisors is an integer number (15711822810585).

Almost surely, 2^{31423645621169} is an apocalyptic number.

It is an amenable number.

31423645621169 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423645621169 is an equidigital number, since it uses as much as digits as its factorization.

31423645621169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 53.

The spelling of 31423645621169 in words is "thirty-one trillion, four hundred twenty-three billion, six hundred forty-five million, six hundred twenty-one thousand, one hundred sixty-nine".