991601892 has 48 divisors (see below), whose sum is σ = 2633534400. Its totient is φ = 322470720.

The previous prime is 991601881. The next prime is 991601927. The reversal of 991601892 is 298106199.

991601892 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107542 + ... + 116397.

It is an arithmetic number, because the mean of its divisors is an integer number (54865300).

Almost surely, 2^991601892 is an apocalyptic number.

It is an amenable number.

991601892 is an abundant number, since it is smaller than the sum of its proper divisors (1641932508).

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

991601892 is a wasteful number, since it uses less digits than its factorization.

991601892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223993 (or 223985 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 991601892 is about 31489.7108910196. The cubic root of 991601892 is about 997.1927574301.

The spelling of 991601892 in words is "nine hundred ninety-one million, six hundred one thousand, eight hundred ninety-two".