31225425169 has 2 divisors, whose sum is σ = 31225425170. Its totient is φ = 31225425168.

The previous prime is 31225425131. The next prime is 31225425173. The reversal of 31225425169 is 96152452213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15872976144 + 15352449025 = 125988^2 + 123905^2 .

It is a cyclic number.

It is not a de Polignac number, because 31225425169 - 2⁷ = 31225425041 is a prime.

It is a super-2 number, since 2×31225425169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31225423169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612712584 + 15612712585.

It is an arithmetic number, because the mean of its divisors is an integer number (15612712585).

Almost surely, 2^31225425169 is an apocalyptic number.

It is an amenable number.

31225425169 is a deficient number, since it is larger than the sum of its proper divisors (1).

31225425169 is an equidigital number, since it uses as much as digits as its factorization.

31225425169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 40.

The spelling of 31225425169 in words is "thirty-one billion, two hundred twenty-five million, four hundred twenty-five thousand, one hundred sixty-nine".