1279591 has 4 divisors (see below), whose sum is σ = 1283184. Its totient is φ = 1276000.

The previous prime is 1279583. The next prime is 1279601. The reversal of 1279591 is 1959721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1279591 - 2³ = 1279583 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 (1279511) 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, 1195 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (320796).

2^1279591 is an apocalyptic number.

1279591 is a deficient number, since it is larger than the sum of its proper divisors (3593).

1279591 is an equidigital number, since it uses as much as digits as its factorization.

1279591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3592.

The product of its digits is 5670, while the sum is 34.

The square root of 1279591 is about 1131.1900812861. The cubic root of 1279591 is about 108.5651388818.

The spelling of 1279591 in words is "one million, two hundred seventy-nine thousand, five hundred ninety-one".