9010900991 has 16 divisors (see below), whose sum is σ = 9334575360. Its totient is φ = 8693092800.

The previous prime is 9010900981. The next prime is 9010900999. The reversal of 9010900991 is 1990090109.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9010900991 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 (9010900999) 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, 1158371 + ... + 1166123.

It is an arithmetic number, because the mean of its divisors is an integer number (583410960).

Almost surely, 2^9010900991 is an apocalyptic number.

9010900991 is a deficient number, since it is larger than the sum of its proper divisors (323674369).

9010900991 is a wasteful number, since it uses less digits than its factorization.

9010900991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8126.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 9010900991 is about 94925.7656856135. The cubic root of 9010900991 is about 2080.9232981032.

The spelling of 9010900991 in words is "nine billion, ten million, nine hundred thousand, nine hundred ninety-one".