190723891 has 2 divisors, whose sum is σ = 190723892. Its totient is φ = 190723890.

The previous prime is 190723849. The next prime is 190723903. The reversal of 190723891 is 198327091.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190723891 is a prime.

It is not a weakly prime, because it can be changed into another prime (190723801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95361945 + 95361946.

It is an arithmetic number, because the mean of its divisors is an integer number (95361946).

Almost surely, 2^190723891 is an apocalyptic number.

190723891 is a deficient number, since it is larger than the sum of its proper divisors (1).

190723891 is an equidigital number, since it uses as much as digits as its factorization.

190723891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 190723891 is about 13810.2820753234. The cubic root of 190723891 is about 575.6188834874.

The spelling of 190723891 in words is "one hundred ninety million, seven hundred twenty-three thousand, eight hundred ninety-one".