1181231 has 4 divisors (see below), whose sum is σ = 1186752. Its totient is φ = 1175712.

The previous prime is 1181209. The next prime is 1181237. The reversal of 1181231 is 1321811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1181231 is a prime.

It is a super-2 number, since 2×1181231² = 2790613350722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181237) 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, 2426 + ... + 2871.

It is an arithmetic number, because the mean of its divisors is an integer number (296688).

2^1181231 is an apocalyptic number.

1181231 is a deficient number, since it is larger than the sum of its proper divisors (5521).

1181231 is an equidigital number, since it uses as much as digits as its factorization.

1181231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5520.

The product of its digits is 48, while the sum is 17.

The square root of 1181231 is about 1086.8445150986. The cubic root of 1181231 is about 105.7089142111.

The spelling of 1181231 in words is "one million, one hundred eighty-one thousand, two hundred thirty-one".