190540409 has 2 divisors, whose sum is σ = 190540410. Its totient is φ = 190540408.

The previous prime is 190540391. The next prime is 190540423. The reversal of 190540409 is 904045091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185722384 + 4818025 = 13628^2 + 2195^2 .

It is a cyclic number.

It is not a de Polignac number, because 190540409 - 2²⁴ = 173763193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (190510409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95270204 + 95270205.

It is an arithmetic number, because the mean of its divisors is an integer number (95270205).

Almost surely, 2^190540409 is an apocalyptic number.

It is an amenable number.

190540409 is a deficient number, since it is larger than the sum of its proper divisors (1).

190540409 is an equidigital number, since it uses as much as digits as its factorization.

190540409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 190540409 is about 13803.6375278403. The cubic root of 190540409 is about 575.4342368235.

The spelling of 190540409 in words is "one hundred ninety million, five hundred forty thousand, four hundred nine".