1131231 has 16 divisors (see below), whose sum is σ = 1639008. Its totient is φ = 691200.

The previous prime is 1131223. The next prime is 1131239. The reversal of 1131231 is 1321311.

It is an interprime number because it is at equal distance from previous prime (1131223) and next prime (1131239).

It is not a de Polignac number, because 1131231 - 2³ = 1131223 is a prime.

It is a super-2 number, since 2×1131231² = 2559367150722, which contains 22 as substring.

1131231 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1821 + ... + 2361.

It is an arithmetic number, because the mean of its divisors is an integer number (102438).

2^1131231 is an apocalyptic number.

1131231 is a deficient number, since it is larger than the sum of its proper divisors (507777).

1131231 is a wasteful number, since it uses less digits than its factorization.

1131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602.

The product of its digits is 18, while the sum is 12.

The square root of 1131231 is about 1063.5934373622. The cubic root of 1131231 is about 104.1958525862.

Adding to 1131231 its reverse (1321311), we get a palindrome (2452542).

The spelling of 1131231 in words is "one million, one hundred thirty-one thousand, two hundred thirty-one".