2191689088 has 32 divisors (see below), whose sum is σ = 4507110720. Its totient is φ = 1060492800.

The previous prime is 2191689041. The next prime is 2191689089. The reversal of 2191689088 is 8809861912.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191689089) 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, 272203 + ... + 280138.

It is an arithmetic number, because the mean of its divisors is an integer number (140847210).

Almost surely, 2^2191689088 is an apocalyptic number.

It is an amenable number.

2191689088 is an abundant number, since it is smaller than the sum of its proper divisors (2315421632).

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

2191689088 is an equidigital number, since it uses as much as digits as its factorization.

2191689088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552386 (or 552374 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 52.

The square root of 2191689088 is about 46815.4791495292. The cubic root of 2191689088 is about 1298.9516376339.

The spelling of 2191689088 in words is "two billion, one hundred ninety-one million, six hundred eighty-nine thousand, eighty-eight".