190391 has 2 divisors, whose sum is σ = 190392. Its totient is φ = 190390.

The previous prime is 190387. The next prime is 190403. The reversal of 190391 is 193091.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 190391 - 2² = 190387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95195 + 95196.

It is an arithmetic number, because the mean of its divisors is an integer number (95196).

2¹⁹⁰³⁹¹ is an apocalyptic number.

190391 is a deficient number, since it is larger than the sum of its proper divisors (1).

190391 is an equidigital number, since it uses as much as digits as its factorization.

190391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 190391 is about 436.3381716055. The cubic root of 190391 is about 57.5283791858.

The spelling of 190391 in words is "one hundred ninety thousand, three hundred ninety-one".