1231159 has 4 divisors (see below), whose sum is σ = 1243216. Its totient is φ = 1219104.

The previous prime is 1231141. The next prime is 1231171. The reversal of 1231159 is 9511321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9511321 = 541 ⋅17581.

It is a cyclic number.

It is not a de Polignac number, because 1231159 - 2⁵ = 1231127 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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5874 + ... + 6079.

It is an arithmetic number, because the mean of its divisors is an integer number (310804).

2^1231159 is an apocalyptic number.

1231159 is a deficient number, since it is larger than the sum of its proper divisors (12057).

1231159 is a wasteful number, since it uses less digits than its factorization.

1231159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12056.

The product of its digits is 270, while the sum is 22.

The square root of 1231159 is about 1109.5760451632. The cubic root of 1231159 is about 107.1777695327.

The spelling of 1231159 in words is "one million, two hundred thirty-one thousand, one hundred fifty-nine".