31121869473 has 12 divisors (see below), whose sum is σ = 44973653140. Its totient is φ = 20738755296.

The previous prime is 31121869469. The next prime is 31121869483. The reversal of 31121869473 is 37496812113.

31121869473 is a `hidden beast` number, since 3 + 112 + 1 + 8 + 69 + 473 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11169741969 + 19952127504 = 105687^2 + 141252^2 .

It is not a de Polignac number, because 31121869473 - 2² = 31121869469 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121869483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 741586 + ... + 782427.

Almost surely, 2^31121869473 is an apocalyptic number.

It is an amenable number.

31121869473 is a deficient number, since it is larger than the sum of its proper divisors (13851783667).

31121869473 is a wasteful number, since it uses less digits than its factorization.

31121869473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526288 (or 1526285 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 31121869473 in words is "thirty-one billion, one hundred twenty-one million, eight hundred sixty-nine thousand, four hundred seventy-three".