31547394889 has 2 divisors, whose sum is σ = 31547394890. Its totient is φ = 31547394888.

The previous prime is 31547394877. The next prime is 31547394919. The reversal of 31547394889 is 98849374513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31216882489 + 330512400 = 176683^2 + 18180^2 .

It is a cyclic number.

It is not a de Polignac number, because 31547394889 - 2¹³ = 31547386697 is a prime.

It is not a weakly prime, because it can be changed into another prime (31547394089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15773697444 + 15773697445.

It is an arithmetic number, because the mean of its divisors is an integer number (15773697445).

Almost surely, 2^31547394889 is an apocalyptic number.

It is an amenable number.

31547394889 is a deficient number, since it is larger than the sum of its proper divisors (1).

31547394889 is an equidigital number, since it uses as much as digits as its factorization.

31547394889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 61.

The spelling of 31547394889 in words is "thirty-one billion, five hundred forty-seven million, three hundred ninety-four thousand, eight hundred eighty-nine".