2091808231 has 4 divisors (see below), whose sum is σ = 2214855792. Its totient is φ = 1968760672.

The previous prime is 2091808223. The next prime is 2091808241. The reversal of 2091808231 is 1328081902.

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

It is a cyclic number.

It is not a de Polignac number, because 2091808231 - 2³ = 2091808223 is a prime.

It is a super-2 number, since 2×2091808231² = 8751323350558698722, which contains 22 as substring.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 2091 and 808231 contains 2091808231 itself.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091808241) 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, 61523755 + ... + 61523788.

It is an arithmetic number, because the mean of its divisors is an integer number (553713948).

Almost surely, 2^2091808231 is an apocalyptic number.

2091808231 is a deficient number, since it is larger than the sum of its proper divisors (123047561).

2091808231 is a wasteful number, since it uses less digits than its factorization.

2091808231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123047560.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 2091808231 is about 45736.2900878504. The cubic root of 2091808231 is about 1278.9118826764.

The spelling of 2091808231 in words is "two billion, ninety-one million, eight hundred eight thousand, two hundred thirty-one".