31678623589 has 2 divisors, whose sum is σ = 31678623590. Its totient is φ = 31678623588.

The previous prime is 31678623569. The next prime is 31678623617. The reversal of 31678623589 is 98532687613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19052280900 + 12626342689 = 138030^2 + 112367^2 .

It is a cyclic number.

It is not a de Polignac number, because 31678623589 - 2²¹ = 31676526437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31678623569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15839311794 + 15839311795.

It is an arithmetic number, because the mean of its divisors is an integer number (15839311795).

Almost surely, 2^31678623589 is an apocalyptic number.

It is an amenable number.

31678623589 is a deficient number, since it is larger than the sum of its proper divisors (1).

31678623589 is an equidigital number, since it uses as much as digits as its factorization.

31678623589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 58.

The spelling of 31678623589 in words is "thirty-one billion, six hundred seventy-eight million, six hundred twenty-three thousand, five hundred eighty-nine".