31184564978089 has 4 divisors (see below), whose sum is σ = 31196462945220. Its totient is φ = 31172667010960.

The previous prime is 31184564978081. The next prime is 31184564978113. The reversal of 31184564978089 is 98087946548113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25727131684864 + 5457433293225 = 5072192^2 + 2336115^2 .

It is a cyclic number.

It is not a de Polignac number, because 31184564978089 - 2³ = 31184564978081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31184564978081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5948979634 + ... + 5948984875.

It is an arithmetic number, because the mean of its divisors is an integer number (7799115736305).

Almost surely, 2^{31184564978089} is an apocalyptic number.

It is an amenable number.

31184564978089 is a deficient number, since it is larger than the sum of its proper divisors (11897967131).

31184564978089 is a wasteful number, since it uses less digits than its factorization.

31184564978089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11897967130.

The product of its (nonzero) digits is 418037760, while the sum is 73.

The spelling of 31184564978089 in words is "thirty-one trillion, one hundred eighty-four billion, five hundred sixty-four million, nine hundred seventy-eight thousand, eighty-nine".