9010000991 has 4 divisors (see below), whose sum is σ = 9059780184. Its totient is φ = 8960221800.

The previous prime is 9010000973. The next prime is 9010001027. The reversal of 9010000991 is 1990000109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1990000109 = 233 ⋅8540773.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9010000991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9010000091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24889325 + ... + 24889686.

It is an arithmetic number, because the mean of its divisors is an integer number (2264945046).

Almost surely, 2^9010000991 is an apocalyptic number.

9010000991 is a deficient number, since it is larger than the sum of its proper divisors (49779193).

9010000991 is a wasteful number, since it uses less digits than its factorization.

9010000991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49779192.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 9010000991 is about 94921.0250208035. The cubic root of 9010000991 is about 2080.8540156003.

The spelling of 9010000991 in words is "nine billion, ten million, nine hundred ninety-one", and thus it is an aban number.