1131239 has 2 divisors, whose sum is σ = 1131240. Its totient is φ = 1131238.

The previous prime is 1131223. The next prime is 1131253. The reversal of 1131239 is 9321311.

It is a strong prime.

It is an emirp because it is prime and its reverse (9321311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131239 - 2⁴ = 1131223 is a prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 1131239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565619 + 565620.

It is an arithmetic number, because the mean of its divisors is an integer number (565620).

2^1131239 is an apocalyptic number.

1131239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131239 is an equidigital number, since it uses as much as digits as its factorization.

1131239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 20.

The square root of 1131239 is about 1063.5971981911. The cubic root of 1131239 is about 104.1960982080.

The spelling of 1131239 in words is "one million, one hundred thirty-one thousand, two hundred thirty-nine".