11990999 has 2 divisors, whose sum is σ = 11991000. Its totient is φ = 11990998.

The previous prime is 11990989. The next prime is 11991011. The reversal of 11990999 is 99909911.

11990999 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 11990999 - 2⁸ = 11990743 is a prime.

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 (11990939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5995499 + 5995500.

It is an arithmetic number, because the mean of its divisors is an integer number (5995500).

Almost surely, 2^11990999 is an apocalyptic number.

11990999 is a deficient number, since it is larger than the sum of its proper divisors (1).

11990999 is an equidigital number, since it uses as much as digits as its factorization.

11990999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 59049, while the sum is 47.

The square root of 11990999 is about 3462.8021889793. The cubic root of 11990999 is about 228.8855921209.

The spelling of 11990999 in words is "eleven million, nine hundred ninety thousand, nine hundred ninety-nine".