19091000956 has 12 divisors (see below), whose sum is σ = 35167633480. Its totient is φ = 9043105680.

The previous prime is 19091000941. The next prime is 19091000989. The reversal of 19091000956 is 65900019091.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 125598615 + ... + 125598766.

Almost surely, 2^19091000956 is an apocalyptic number.

19091000956 is the 87387-th centered pentagonal number.

It is an amenable number.

19091000956 is a deficient number, since it is larger than the sum of its proper divisors (16076632524).

19091000956 is a wasteful number, since it uses less digits than its factorization.

19091000956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251197404 (or 251197402 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 40.

The spelling of 19091000956 in words is "nineteen billion, ninety-one million, nine hundred fifty-six", and thus it is an aban number.