1231156 has 12 divisors (see below), whose sum is σ = 2163168. Its totient is φ = 613112.

The previous prime is 1231141. The next prime is 1231171. The reversal of 1231156 is 6511321.

It is an interprime number because it is at equal distance from previous prime (1231141) and next prime (1231171).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 945 + ... + 1831.

It is an arithmetic number, because the mean of its divisors is an integer number (180264).

2^1231156 is an apocalyptic number.

It is an amenable number.

1231156 is a deficient number, since it is larger than the sum of its proper divisors (932012).

1231156 is a wasteful number, since it uses less digits than its factorization.

1231156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238 (or 1236 counting only the distinct ones).

The product of its digits is 180, while the sum is 19.

The square root of 1231156 is about 1109.5746932947. The cubic root of 1231156 is about 107.1776824782.

Adding to 1231156 its reverse (6511321), we get a palindrome (7742477).

The spelling of 1231156 in words is "one million, two hundred thirty-one thousand, one hundred fifty-six".