881090991 has 12 divisors (see below), whose sum is σ = 1388385960. Its totient is φ = 533994480.

The previous prime is 881090989. The next prime is 881091017. The reversal of 881090991 is 199090188.

It is not a de Polignac number, because 881090991 - 2¹ = 881090989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (881090981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4449856 + ... + 4450053.

It is an arithmetic number, because the mean of its divisors is an integer number (115698830).

Almost surely, 2^881090991 is an apocalyptic number.

881090991 is a deficient number, since it is larger than the sum of its proper divisors (507294969).

881090991 is a wasteful number, since it uses less digits than its factorization.

881090991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8899926 (or 8899923 counting only the distinct ones).

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

The square root of 881090991 is about 29683.1769020770. The cubic root of 881090991 is about 958.6798227144.

The spelling of 881090991 in words is "eight hundred eighty-one million, ninety thousand, nine hundred ninety-one".