11915999 has 2 divisors, whose sum is σ = 11916000. Its totient is φ = 11915998.

The previous prime is 11915933. The next prime is 11916007. The reversal of 11915999 is 99951911.

11915999 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11915999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11915399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5957999 + 5958000.

It is an arithmetic number, because the mean of its divisors is an integer number (5958000).

Almost surely, 2^11915999 is an apocalyptic number.

11915999 is a deficient number, since it is larger than the sum of its proper divisors (1).

11915999 is an equidigital number, since it uses as much as digits as its factorization.

11915999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32805, while the sum is 44.

The square root of 11915999 is about 3451.9558224288. The cubic root of 11915999 is about 228.4073908047.

The spelling of 11915999 in words is "eleven million, nine hundred fifteen thousand, nine hundred ninety-nine".