2191032385 has 4 divisors (see below), whose sum is σ = 2629238868. Its totient is φ = 1752825904.

The previous prime is 2191032317. The next prime is 2191032391. The reversal of 2191032385 is 5832301912.

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

It can be written as a sum of positive squares in 2 ways, for example, as 866654721 + 1324377664 = 29439^2 + 36392^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191032385 - 2²¹ = 2188935233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2191032385.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219103234 + ... + 219103243.

It is an arithmetic number, because the mean of its divisors is an integer number (657309717).

Almost surely, 2^2191032385 is an apocalyptic number.

It is an amenable number.

2191032385 is a deficient number, since it is larger than the sum of its proper divisors (438206483).

2191032385 is an equidigital number, since it uses as much as digits as its factorization.

2191032385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438206482.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 2191032385 is about 46808.4648861720. The cubic root of 2191032385 is about 1298.8218882921.

The spelling of 2191032385 in words is "two billion, one hundred ninety-one million, thirty-two thousand, three hundred eighty-five".