19291091931 has 24 divisors (see below), whose sum is σ = 28711386704. Its totient is φ = 12472315200.

The previous prime is 19291091927. The next prime is 19291091933. The reversal of 19291091931 is 13919019291.

It is not a de Polignac number, because 19291091931 - 2² = 19291091927 is a prime.

It is a super-2 number, since 2×19291091931² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19291091933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7881 + ... + 196581.

Almost surely, 2^19291091931 is an apocalyptic number.

19291091931 is a deficient number, since it is larger than the sum of its proper divisors (9420294773).

19291091931 is a wasteful number, since it uses less digits than its factorization.

19291091931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189051 (or 189048 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 45.

The spelling of 19291091931 in words is "nineteen billion, two hundred ninety-one million, ninety-one thousand, nine hundred thirty-one".