1111099999 has 4 divisors (see below), whose sum is σ = 1111189960. Its totient is φ = 1111010040.

The previous prime is 1111099981. The next prime is 1111100021. The reversal of 1111099999 is 9999901111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1111099999 - 2²¹ = 1109002847 is a prime.

It is a Duffinian number.

1111099999 is a modest number, since divided by 99999 gives 11110 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111099909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22812 + ... + 52369.

It is an arithmetic number, because the mean of its divisors is an integer number (277797490).

Almost surely, 2^1111099999 is an apocalyptic number.

1111099999 is a deficient number, since it is larger than the sum of its proper divisors (89961).

1111099999 is an equidigital number, since it uses as much as digits as its factorization.

1111099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89960.

The product of its (nonzero) digits is 59049, while the sum is 49.

The square root of 1111099999 is about 33333.1666512499. The cubic root of 1111099999 is about 1035.7407158485.

The spelling of 1111099999 in words is "one billion, one hundred eleven million, ninety-nine thousand, nine hundred ninety-nine".