31578341930489 has 2 divisors, whose sum is σ = 31578341930490. Its totient is φ = 31578341930488.

The previous prime is 31578341930477. The next prime is 31578341930503. The reversal of 31578341930489 is 98403914387513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19678912232464 + 11899429698025 = 4436092^2 + 3449555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31578341930489 is a prime.

It is not a weakly prime, because it can be changed into another prime (31578341930089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15789170965244 + 15789170965245.

It is an arithmetic number, because the mean of its divisors is an integer number (15789170965245).

Almost surely, 2^{31578341930489} is an apocalyptic number.

It is an amenable number.

31578341930489 is a deficient number, since it is larger than the sum of its proper divisors (1).

31578341930489 is an equidigital number, since it uses as much as digits as its factorization.

31578341930489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78382080, while the sum is 65.

The spelling of 31578341930489 in words is "thirty-one trillion, five hundred seventy-eight billion, three hundred forty-one million, nine hundred thirty thousand, four hundred eighty-nine".