2109991536 has 30 divisors (see below), whose sum is σ = 5905046160. Its totient is φ = 703330464.

The previous prime is 2109991519. The next prime is 2109991547. The reversal of 2109991536 is 6351999012.

It is a happy number.

2109991536 is a `hidden beast` number, since 2 + 109 + 9 + 9 + 1 + 536 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 2109991491 and 2109991500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7326216 + ... + 7326503.

It is an arithmetic number, because the mean of its divisors is an integer number (196834872).

Almost surely, 2^2109991536 is an apocalyptic number.

It is an amenable number.

2109991536 is an abundant number, since it is smaller than the sum of its proper divisors (3795054624).

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

2109991536 is a wasteful number, since it uses less digits than its factorization.

2109991536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14652733 (or 14652724 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 2109991536 is about 45934.6441806182. The cubic root of 2109991536 is about 1282.6068973743.

The spelling of 2109991536 in words is "two billion, one hundred nine million, nine hundred ninety-one thousand, five hundred thirty-six".