11191999 has 16 divisors (see below), whose sum is σ = 14253120. Its totient is φ = 8547840.

The previous prime is 11191993. The next prime is 11192003. The reversal of 11191999 is 99919111.

It is not a de Polignac number, because 11191999 - 2³ = 11191991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11191991) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 519 + ... + 4759.

It is an arithmetic number, because the mean of its divisors is an integer number (890820).

Almost surely, 2^11191999 is an apocalyptic number.

11191999 is a deficient number, since it is larger than the sum of its proper divisors (3061121).

11191999 is a wasteful number, since it uses less digits than its factorization.

11191999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290.

The product of its digits is 6561, while the sum is 40.

The square root of 11191999 is about 3345.4445145601. Note that the first 3 decimals coincide. The cubic root of 11191999 is about 223.6844981637.

The spelling of 11191999 in words is "eleven million, one hundred ninety-one thousand, nine hundred ninety-nine".