9131187989 has 16 divisors (see below), whose sum is σ = 11389243776. Its totient is φ = 7112145600.

The previous prime is 9131187971. The next prime is 9131188007. The reversal of 9131187989 is 9897811319.

It is an interprime number because it is at equal distance from previous prime (9131187971) and next prime (9131188007).

It is a de Polignac number, because none of the positive numbers 2^k-9131187989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9131181989) 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, 163319 + ... + 211979.

It is an arithmetic number, because the mean of its divisors is an integer number (711827736).

Almost surely, 2^9131187989 is an apocalyptic number.

It is an amenable number.

9131187989 is a deficient number, since it is larger than the sum of its proper divisors (2258055787).

9131187989 is a wasteful number, since it uses less digits than its factorization.

9131187989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51116.

The product of its digits is 979776, while the sum is 56.

The square root of 9131187989 is about 95557.2497982231. The cubic root of 9131187989 is about 2090.1418513643.

The spelling of 9131187989 in words is "nine billion, one hundred thirty-one million, one hundred eighty-seven thousand, nine hundred eighty-nine".