190999409 has 2 divisors, whose sum is σ = 190999410. Its totient is φ = 190999408.

The previous prime is 190999321. The next prime is 190999451. The reversal of 190999409 is 904999091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160782400 + 30217009 = 12680^2 + 5497^2 .

It is a cyclic number.

It is not a de Polignac number, because 190999409 - 2²⁰ = 189950833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (190999469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95499704 + 95499705.

It is an arithmetic number, because the mean of its divisors is an integer number (95499705).

Almost surely, 2^190999409 is an apocalyptic number.

It is an amenable number.

190999409 is a deficient number, since it is larger than the sum of its proper divisors (1).

190999409 is an equidigital number, since it uses as much as digits as its factorization.

190999409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 236196, while the sum is 50.

The square root of 190999409 is about 13820.2535794391. The cubic root of 190999409 is about 575.8959280611.

The spelling of 190999409 in words is "one hundred ninety million, nine hundred ninety-nine thousand, four hundred nine".