1231111099 has 16 divisors (see below), whose sum is σ = 1315434400. Its totient is φ = 1148857344.

The previous prime is 1231111093. The next prime is 1231111129. The reversal of 1231111099 is 9901111321.

It is not a de Polignac number, because 1231111099 - 2⁵ = 1231111067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231111093) 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, 420589 + ... + 423505.

It is an arithmetic number, because the mean of its divisors is an integer number (82214650).

Almost surely, 2^1231111099 is an apocalyptic number.

1231111099 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1231111099 is a deficient number, since it is larger than the sum of its proper divisors (84323301).

1231111099 is a wasteful number, since it uses less digits than its factorization.

1231111099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262.

The product of its (nonzero) digits is 486, while the sum is 28.

The square root of 1231111099 is about 35087.1928059228. The cubic root of 1231111099 is about 1071.7637951752.

The spelling of 1231111099 in words is "one billion, two hundred thirty-one million, one hundred eleven thousand, ninety-nine".