111143209 has 2 divisors, whose sum is σ = 111143210. Its totient is φ = 111143208.

The previous prime is 111143189. The next prime is 111143237. The reversal of 111143209 is 902341111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71453209 + 39690000 = 8453^2 + 6300^2 .

It is a cyclic number.

It is not a de Polignac number, because 111143209 - 2²¹ = 109046057 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111143209.

It is not a weakly prime, because it can be changed into another prime (111143239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55571604 + 55571605.

It is an arithmetic number, because the mean of its divisors is an integer number (55571605).

Almost surely, 2^111143209 is an apocalyptic number.

It is an amenable number.

111143209 is a deficient number, since it is larger than the sum of its proper divisors (1).

111143209 is an equidigital number, since it uses as much as digits as its factorization.

111143209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 111143209 is about 10542.4479605071. The cubic root of 111143209 is about 480.7961454786.

The spelling of 111143209 in words is "one hundred eleven million, one hundred forty-three thousand, two hundred nine".