191808001 has 32 divisors (see below), whose sum is σ = 252576000. Its totient is φ = 144224640.

The previous prime is 191807981. The next prime is 191808013. The reversal of 191808001 is 100808191.

It is not a de Polignac number, because 191808001 - 2⁵ = 191807969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191808101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108541 + ... + 110293.

It is an arithmetic number, because the mean of its divisors is an integer number (7893000).

Almost surely, 2^191808001 is an apocalyptic number.

191808001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

191808001 is a deficient number, since it is larger than the sum of its proper divisors (60767999).

191808001 is a wasteful number, since it uses less digits than its factorization.

191808001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814 (or 1800 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 191808001 is about 13849.4765605058. The cubic root of 191808001 is about 576.7074650469.

The spelling of 191808001 in words is "one hundred ninety-one million, eight hundred eight thousand, one".