1008880991 has 4 divisors (see below), whose sum is σ = 1030346592. Its totient is φ = 987415392.

The previous prime is 1008880933. The next prime is 1008881011. The reversal of 1008880991 is 1990888001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1008880991 - 2⁶ = 1008880927 is a prime.

It is a super-2 number, since 2×1008880991² = 2035681708002284162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1008880091) 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, 10732730 + ... + 10732823.

It is an arithmetic number, because the mean of its divisors is an integer number (257586648).

Almost surely, 2^1008880991 is an apocalyptic number.

1008880991 is a deficient number, since it is larger than the sum of its proper divisors (21465601).

1008880991 is an equidigital number, since it uses as much as digits as its factorization.

1008880991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21465600.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 1008880991 is about 31762.8870066938. The cubic root of 1008880991 is about 1002.9516097617.

The spelling of 1008880991 in words is "one billion, eight million, eight hundred eighty thousand, nine hundred ninety-one".