31197981073 has 16 divisors (see below), whose sum is σ = 35973181440. Its totient is φ = 26503031376.

The previous prime is 31197981071. The next prime is 31197981131. The reversal of 31197981073 is 37018979113.

It is a cyclic number.

It is not a de Polignac number, because 31197981073 - 2¹ = 31197981071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31197981071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543840 + ... + 598462.

It is an arithmetic number, because the mean of its divisors is an integer number (2248323840).

Almost surely, 2^31197981073 is an apocalyptic number.

It is an amenable number.

31197981073 is a deficient number, since it is larger than the sum of its proper divisors (4775200367).

31197981073 is a wasteful number, since it uses less digits than its factorization.

31197981073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55356.

The product of its (nonzero) digits is 285768, while the sum is 49.

The spelling of 31197981073 in words is "thirty-one billion, one hundred ninety-seven million, nine hundred eighty-one thousand, seventy-three".