19909112031 has 12 divisors (see below), whose sum is σ = 28759648008. Its totient is φ = 13271799024.

The previous prime is 19909112023. The next prime is 19909112117. The reversal of 19909112031 is 13021190991.

It is not a de Polignac number, because 19909112031 - 2³ = 19909112023 is a prime.

It is a super-2 number, since 2×19909112031² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19909110031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70081 + ... + 211493.

It is an arithmetic number, because the mean of its divisors is an integer number (2396637334).

Almost surely, 2^19909112031 is an apocalyptic number.

19909112031 is a deficient number, since it is larger than the sum of its proper divisors (8850535977).

19909112031 is a wasteful number, since it uses less digits than its factorization.

19909112031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157062 (or 157059 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The spelling of 19909112031 in words is "nineteen billion, nine hundred nine million, one hundred twelve thousand, thirty-one".