2191653805 has 8 divisors (see below), whose sum is σ = 2869074144. Its totient is φ = 1593930000.

The previous prime is 2191653797. The next prime is 2191653833. The reversal of 2191653805 is 5083561912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2191653805 - 2³ = 2191653797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19924071 + ... + 19924180.

It is an arithmetic number, because the mean of its divisors is an integer number (358634268).

Almost surely, 2^2191653805 is an apocalyptic number.

It is an amenable number.

2191653805 is a deficient number, since it is larger than the sum of its proper divisors (677420339).

2191653805 is a wasteful number, since it uses less digits than its factorization.

2191653805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39848267.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 2191653805 is about 46815.1023175214. The cubic root of 2191653805 is about 1298.9446671871.

The spelling of 2191653805 in words is "two billion, one hundred ninety-one million, six hundred fifty-three thousand, eight hundred five".