8501791989 has 16 divisors (see below), whose sum is σ = 11729016000. Its totient is φ = 5471294976.

The previous prime is 8501791981. The next prime is 8501791993. The reversal of 8501791989 is 9891971058.

It is not a de Polignac number, because 8501791989 - 2³ = 8501791981 is a prime.

It is a super-2 number, since 2×8501791989² (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 (8501791981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720862 + ... + 732560.

It is an arithmetic number, because the mean of its divisors is an integer number (733063500).

Almost surely, 2^8501791989 is an apocalyptic number.

It is an amenable number.

8501791989 is a deficient number, since it is larger than the sum of its proper divisors (3227224011).

8501791989 is a wasteful number, since it uses less digits than its factorization.

8501791989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20084.

The product of its (nonzero) digits is 1632960, while the sum is 57.

The square root of 8501791989 is about 92205.1624856222. The cubic root of 8501791989 is about 2040.9709581567.

The spelling of 8501791989 in words is "eight billion, five hundred one million, seven hundred ninety-one thousand, nine hundred eighty-nine".