1291279 has 4 divisors (see below), whose sum is σ = 1408680. Its totient is φ = 1173880.

The previous prime is 1291271. The next prime is 1291313. The reversal of 1291279 is 9721921.

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 1291279 - 2³ = 1291271 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1291279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291271) 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, 58684 + ... + 58705.

It is an arithmetic number, because the mean of its divisors is an integer number (352170).

2^1291279 is an apocalyptic number.

1291279 is a deficient number, since it is larger than the sum of its proper divisors (117401).

1291279 is a wasteful number, since it uses less digits than its factorization.

1291279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117400.

The product of its digits is 2268, while the sum is 31.

The square root of 1291279 is about 1136.3445780220. The cubic root of 1291279 is about 108.8946882854.

The spelling of 1291279 in words is "one million, two hundred ninety-one thousand, two hundred seventy-nine".