1091990592 has 448 divisors, whose sum is σ = 4155033600. Its totient is φ = 272885760.

The previous prime is 1091990587. The next prime is 1091990617. The reversal of 1091990592 is 2950991901.

It is a tau number, because it is divible by the number of its divisors (448).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3858483 + ... + 3858765.

Almost surely, 2^1091990592 is an apocalyptic number.

1091990592 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091990592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2077516800).

1091990592 is an abundant number, since it is smaller than the sum of its proper divisors (3063043008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091990592 is a wasteful number, since it uses less digits than its factorization.

1091990592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 45.

The square root of 1091990592 is about 33045.2809338943. The cubic root of 1091990592 is about 1029.7685696145.

The spelling of 1091990592 in words is "one billion, ninety-one million, nine hundred ninety thousand, five hundred ninety-two".