19091000988 has 18 divisors (see below), whose sum is σ = 48257808144. Its totient is φ = 6363666984.

The previous prime is 19091000941. The next prime is 19091000989. The reversal of 19091000988 is 88900019091.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×19091000988² (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 (19091000989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 265152756 + ... + 265152827.

Almost surely, 2^19091000988 is an apocalyptic number.

19091000988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19091000988 is an abundant number, since it is smaller than the sum of its proper divisors (29166807156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19091000988 is a wasteful number, since it uses less digits than its factorization.

19091000988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530305593 (or 530305588 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The spelling of 19091000988 in words is "nineteen billion, ninety-one million, nine hundred eighty-eight", and thus it is an aban number.