190664819 has 2 divisors, whose sum is σ = 190664820. Its totient is φ = 190664818.

The previous prime is 190664807. The next prime is 190664839. The reversal of 190664819 is 918466091.

It is a weak prime.

It is an emirp because it is prime and its reverse (918466091) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190664819 is a prime.

It is a super-2 number, since 2×190664819² = 72706146408605522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 190664819.

It is not a weakly prime, because it can be changed into another prime (190664839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95332409 + 95332410.

It is an arithmetic number, because the mean of its divisors is an integer number (95332410).

Almost surely, 2^190664819 is an apocalyptic number.

190664819 is a deficient number, since it is larger than the sum of its proper divisors (1).

190664819 is an equidigital number, since it uses as much as digits as its factorization.

190664819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 190664819 is about 13808.1432133361. The cubic root of 190664819 is about 575.5594494549.

The spelling of 190664819 in words is "one hundred ninety million, six hundred sixty-four thousand, eight hundred nineteen".