31225489693 has 2 divisors, whose sum is σ = 31225489694. Its totient is φ = 31225489692.

The previous prime is 31225489681. The next prime is 31225489717. The reversal of 31225489693 is 39698452213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16016927364 + 15208562329 = 126558^2 + 123323^2 .

It is a cyclic number.

It is not a de Polignac number, because 31225489693 - 2¹⁷ = 31225358621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31225489693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31225489613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612744846 + 15612744847.

It is an arithmetic number, because the mean of its divisors is an integer number (15612744847).

Almost surely, 2^31225489693 is an apocalyptic number.

It is an amenable number.

31225489693 is a deficient number, since it is larger than the sum of its proper divisors (1).

31225489693 is an equidigital number, since it uses as much as digits as its factorization.

31225489693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 52.

The spelling of 31225489693 in words is "thirty-one billion, two hundred twenty-five million, four hundred eighty-nine thousand, six hundred ninety-three".