111142209 has 16 divisors (see below), whose sum is σ = 158061888. Its totient is φ = 69222912.

The previous prime is 111142133. The next prime is 111142217. The reversal of 111142209 is 902241111.

It is a happy number.

It is not a de Polignac number, because 111142209 - 2¹⁵ = 111109441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111142259) 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, 967 + ... + 14940.

It is an arithmetic number, because the mean of its divisors is an integer number (9878868).

Almost surely, 2^111142209 is an apocalyptic number.

It is an amenable number.

111142209 is a deficient number, since it is larger than the sum of its proper divisors (46919679).

111142209 is a wasteful number, since it uses less digits than its factorization.

111142209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16064.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 111142209 is about 10542.4005330854. The cubic root of 111142209 is about 480.7947035024.

The spelling of 111142209 in words is "one hundred eleven million, one hundred forty-two thousand, two hundred nine".