190555991 has 8 divisors (see below), whose sum is σ = 191982960. Its totient is φ = 189134848.

The previous prime is 190555961. The next prime is 190556011. The reversal of 190555991 is 199555091.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 190555991 - 2¹⁸ = 190293847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190555901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80300 + ... + 82638.

It is an arithmetic number, because the mean of its divisors is an integer number (23997870).

Almost surely, 2^190555991 is an apocalyptic number.

190555991 is a deficient number, since it is larger than the sum of its proper divisors (1426969).

190555991 is a wasteful number, since it uses less digits than its factorization.

190555991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913.

The product of its (nonzero) digits is 91125, while the sum is 44.

The square root of 190555991 is about 13804.2019327450. The cubic root of 190555991 is about 575.4499223360.

The spelling of 190555991 in words is "one hundred ninety million, five hundred fifty-five thousand, nine hundred ninety-one".