11781099 has 16 divisors (see below), whose sum is σ = 19040640. Its totient is φ = 7139880.

The previous prime is 11781089. The next prime is 11781139. The reversal of 11781099 is 99018711.

It is not a de Polignac number, because 11781099 - 2⁷ = 11780971 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (11781089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19537 + ... + 20130.

It is an arithmetic number, because the mean of its divisors is an integer number (1190040).

Almost surely, 2^11781099 is an apocalyptic number.

11781099 is a deficient number, since it is larger than the sum of its proper divisors (7259541).

11781099 is a wasteful number, since it uses less digits than its factorization.

11781099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39687 (or 39681 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

The square root of 11781099 is about 3432.3605579834. The cubic root of 11781099 is about 227.5421907823.

The spelling of 11781099 in words is "eleven million, seven hundred eighty-one thousand, ninety-nine".