190851991 has 8 divisors (see below), whose sum is σ = 208304784. Its totient is φ = 173416320.

The previous prime is 190851977. The next prime is 190852001. The reversal of 190851991 is 199158091.

190851991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 190851991 - 2¹³ = 190843799 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 (190851901) 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, 33825 + ... + 39061.

It is an arithmetic number, because the mean of its divisors is an integer number (26038098).

Almost surely, 2^190851991 is an apocalyptic number.

190851991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

190851991 is a deficient number, since it is larger than the sum of its proper divisors (17452793).

190851991 is a wasteful number, since it uses less digits than its factorization.

190851991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8561.

The product of its (nonzero) digits is 29160, while the sum is 43.

The square root of 190851991 is about 13814.9191456193. The cubic root of 190851991 is about 575.7477264206.

The spelling of 190851991 in words is "one hundred ninety million, eight hundred fifty-one thousand, nine hundred ninety-one".