191145900 has 72 divisors (see below), whose sum is σ = 603336384. Its totient is φ = 46337600.

The previous prime is 191145883. The next prime is 191145937. The reversal of 191145900 is 9541191.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25662 + ... + 32261.

It is an arithmetic number, because the mean of its divisors is an integer number (8379672).

Almost surely, 2^191145900 is an apocalyptic number.

191145900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191145900 is an abundant number, since it is smaller than the sum of its proper divisors (412190484).

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

191145900 is a wasteful number, since it uses less digits than its factorization.

191145900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57951 (or 57944 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 30.

The square root of 191145900 is about 13825.5524301924. The cubic root of 191145900 is about 576.0431222538.

The spelling of 191145900 in words is "one hundred ninety-one million, one hundred forty-five thousand, nine hundred".