1231109 has 4 divisors (see below), whose sum is σ = 1343040. Its totient is φ = 1119180.

The previous prime is 1231099. The next prime is 1231127. The reversal of 1231109 is 9011321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1231109 - 2⁴ = 1231093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231129) 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, 55949 + ... + 55970.

It is an arithmetic number, because the mean of its divisors is an integer number (335760).

2^1231109 is an apocalyptic number.

It is an amenable number.

1231109 is a deficient number, since it is larger than the sum of its proper divisors (111931).

1231109 is a wasteful number, since it uses less digits than its factorization.

1231109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111930.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1231109 is about 1109.5535138063. The cubic root of 1231109 is about 107.1763186069.

The spelling of 1231109 in words is "one million, two hundred thirty-one thousand, one hundred nine".