190937891 has 2 divisors, whose sum is σ = 190937892. Its totient is φ = 190937890.

The previous prime is 190937867. The next prime is 190937899. The reversal of 190937891 is 198739091.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (198739091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190937891 - 2²² = 186743587 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (190937899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95468945 + 95468946.

It is an arithmetic number, because the mean of its divisors is an integer number (95468946).

Almost surely, 2^190937891 is an apocalyptic number.

190937891 is a deficient number, since it is larger than the sum of its proper divisors (1).

190937891 is an equidigital number, since it uses as much as digits as its factorization.

190937891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 190937891 is about 13818.0277536268. The cubic root of 190937891 is about 575.8340923201.

The spelling of 190937891 in words is "one hundred ninety million, nine hundred thirty-seven thousand, eight hundred ninety-one".