190191919 has 4 divisors (see below), whose sum is σ = 200202040. Its totient is φ = 180181800.

The previous prime is 190191887. The next prime is 190191923. The reversal of 190191919 is 919191091.

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 190191919 - 2⁵ = 190191887 is a prime.

It is a super-2 number, since 2×190191919² = 72345932105805122, which contains 22 as substring.

It is a Duffinian number.

190191919 is a modest number, since divided by 191919 gives 190 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190191949) 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, 5005032 + ... + 5005069.

It is an arithmetic number, because the mean of its divisors is an integer number (50050510).

Almost surely, 2^190191919 is an apocalyptic number.

190191919 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

190191919 is a deficient number, since it is larger than the sum of its proper divisors (10010121).

190191919 is a wasteful number, since it uses less digits than its factorization.

190191919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10010120.

The product of its (nonzero) digits is 6561, while the sum is 40.

The square root of 190191919 is about 13791.0086288132. The cubic root of 190191919 is about 575.0832081222.

The spelling of 190191919 in words is "one hundred ninety million, one hundred ninety-one thousand, nine hundred nineteen".