190891549 has 2 divisors, whose sum is σ = 190891550. Its totient is φ = 190891548.

The previous prime is 190891517. The next prime is 190891567. The reversal of 190891549 is 945198091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161925625 + 28965924 = 12725^2 + 5382^2 .

It is a cyclic number.

It is not a de Polignac number, because 190891549 - 2⁵ = 190891517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 190891499 and 190891508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190891579) 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, 95445774 + 95445775.

It is an arithmetic number, because the mean of its divisors is an integer number (95445775).

Almost surely, 2^190891549 is an apocalyptic number.

It is an amenable number.

190891549 is a deficient number, since it is larger than the sum of its proper divisors (1).

190891549 is an equidigital number, since it uses as much as digits as its factorization.

190891549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 46.

The square root of 190891549 is about 13816.3507844872. The cubic root of 190891549 is about 575.7875021914.

The spelling of 190891549 in words is "one hundred ninety million, eight hundred ninety-one thousand, five hundred forty-nine".