19611431919 has 12 divisors (see below), whose sum is σ = 29559260016. Its totient is φ = 12505840512.

The previous prime is 19611431911. The next prime is 19611431953. The reversal of 19611431919 is 91913411691.

19611431919 is a `hidden beast` number, since 1 + 9 + 611 + 4 + 3 + 19 + 19 = 666.

It is not a de Polignac number, because 19611431919 - 2³ = 19611431911 is a prime.

It is a super-2 number, since 2×19611431919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19611431911) 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, 47370402 + ... + 47370815.

It is an arithmetic number, because the mean of its divisors is an integer number (2463271668).

Almost surely, 2^19611431919 is an apocalyptic number.

19611431919 is a deficient number, since it is larger than the sum of its proper divisors (9947828097).

19611431919 is a wasteful number, since it uses less digits than its factorization.

19611431919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94741246 (or 94741243 counting only the distinct ones).

The product of its digits is 52488, while the sum is 45.

The spelling of 19611431919 in words is "nineteen billion, six hundred eleven million, four hundred thirty-one thousand, nine hundred nineteen".