190901 has 2 divisors, whose sum is σ = 190902. Its totient is φ = 190900.

The previous prime is 190891. The next prime is 190909. The reversal of 190901 is 109091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168100 + 22801 = 410^2 + 151^2 .

It is a cyclic number.

It is not a de Polignac number, because 190901 - 2⁶ = 190837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95450 + 95451.

It is an arithmetic number, because the mean of its divisors is an integer number (95451).

2¹⁹⁰⁹⁰¹ is an apocalyptic number.

It is an amenable number.

190901 is a deficient number, since it is larger than the sum of its proper divisors (1).

190901 is an equidigital number, since it uses as much as digits as its factorization.

190901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 190901 is about 436.9221898691. The cubic root of 190901 is about 57.5797004407.

Adding to 190901 its reverse (109091), we get a palindrome (299992).

Subtracting from 190901 its reverse (109091), we obtain a triangular number (81810 = T₄₀₄).

It can be divided in two parts, 19090 and 1, that added together give a palindrome (19091).

The spelling of 190901 in words is "one hundred ninety thousand, nine hundred one".