10889991 has 32 divisors (see below), whose sum is σ = 18606080. Its totient is φ = 6166368.

The previous prime is 10889987. The next prime is 10890023. The reversal of 10889991 is 19998801.

It is not a de Polignac number, because 10889991 - 2² = 10889987 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10889941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29490 + ... + 29856.

It is an arithmetic number, because the mean of its divisors is an integer number (581440).

Almost surely, 2^10889991 is an apocalyptic number.

10889991 is a deficient number, since it is larger than the sum of its proper divisors (7716089).

10889991 is a wasteful number, since it uses less digits than its factorization.

10889991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540 (or 534 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 10889991 is about 3299.9986363634. The cubic root of 10889991 is about 221.6541363888.

The spelling of 10889991 in words is "ten million, eight hundred eighty-nine thousand, nine hundred ninety-one".