1191231 has 12 divisors (see below), whose sum is σ = 1738152. Its totient is φ = 786096.

The previous prime is 1191221. The next prime is 1191247. The reversal of 1191231 is 1321911.

It is not a de Polignac number, because 1191231 - 2⁵ = 1191199 is a prime.

It is a super-2 number, since 2×1191231² = 2838062590722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345 + ... + 1581.

It is an arithmetic number, because the mean of its divisors is an integer number (144846).

2^1191231 is an apocalyptic number.

1191231 is a deficient number, since it is larger than the sum of its proper divisors (546921).

1191231 is a wasteful number, since it uses less digits than its factorization.

1191231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350 (or 1347 counting only the distinct ones).

The product of its digits is 54, while the sum is 18.

The square root of 1191231 is about 1091.4352935470. The cubic root of 1191231 is about 106.0063779241.

The spelling of 1191231 in words is "one million, one hundred ninety-one thousand, two hundred thirty-one".