1091239 has 2 divisors, whose sum is σ = 1091240. Its totient is φ = 1091238.

The previous prime is 1091221. The next prime is 1091243. The reversal of 1091239 is 9321901.

It is a strong prime.

It is an emirp because it is prime and its reverse (9321901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1091239 - 2¹¹ = 1089191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545619 + 545620.

It is an arithmetic number, because the mean of its divisors is an integer number (545620).

2^1091239 is an apocalyptic number.

1091239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091239 is an equidigital number, since it uses as much as digits as its factorization.

1091239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1091239 is about 1044.6238557490. The cubic root of 1091239 is about 102.9532260053.

The spelling of 1091239 in words is "one million, ninety-one thousand, two hundred thirty-nine".