11909519 has 2 divisors, whose sum is σ = 11909520. Its totient is φ = 11909518.

The previous prime is 11909509. The next prime is 11909543. The reversal of 11909519 is 91590911.

11909519 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11909519 - 2⁸ = 11909263 is a prime.

It is a super-2 number, since 2×11909519² = 283673285622722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11909509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5954759 + 5954760.

It is an arithmetic number, because the mean of its divisors is an integer number (5954760).

Almost surely, 2^11909519 is an apocalyptic number.

11909519 is a deficient number, since it is larger than the sum of its proper divisors (1).

11909519 is an equidigital number, since it uses as much as digits as its factorization.

11909519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3645, while the sum is 35.

The square root of 11909519 is about 3451.0170964514. The cubic root of 11909519 is about 228.3659801414.

The spelling of 11909519 in words is "eleven million, nine hundred nine thousand, five hundred nineteen".