11100131209 has 2 divisors, whose sum is σ = 11100131210. Its totient is φ = 11100131208.

The previous prime is 11100131197. The next prime is 11100131257. The reversal of 11100131209 is 90213100111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10804978809 + 295152400 = 103947^2 + 17180^2 .

It is a cyclic number.

It is not a de Polignac number, because 11100131209 - 2¹⁵ = 11100098441 is a prime.

It is not a weakly prime, because it can be changed into another prime (11100138209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550065604 + 5550065605.

It is an arithmetic number, because the mean of its divisors is an integer number (5550065605).

Almost surely, 2^11100131209 is an apocalyptic number.

It is an amenable number.

11100131209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11100131209 is an equidigital number, since it uses as much as digits as its factorization.

11100131209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 19.

The spelling of 11100131209 in words is "eleven billion, one hundred million, one hundred thirty-one thousand, two hundred nine".