31209694489 has 2 divisors, whose sum is σ = 31209694490. Its totient is φ = 31209694488.

The previous prime is 31209694471. The next prime is 31209694553. The reversal of 31209694489 is 98449690213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30134182464 + 1075512025 = 173592^2 + 32795^2 .

It is a cyclic number.

It is not a de Polignac number, because 31209694489 - 2⁵ = 31209694457 is a prime.

It is a super-2 number, since 2×31209694489² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31209694459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15604847244 + 15604847245.

It is an arithmetic number, because the mean of its divisors is an integer number (15604847245).

Almost surely, 2^31209694489 is an apocalyptic number.

It is an amenable number.

31209694489 is a deficient number, since it is larger than the sum of its proper divisors (1).

31209694489 is an equidigital number, since it uses as much as digits as its factorization.

31209694489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 31209694489 in words is "thirty-one billion, two hundred nine million, six hundred ninety-four thousand, four hundred eighty-nine".