1391291 has 4 divisors (see below), whose sum is σ = 1517784. Its totient is φ = 1264800.

The previous prime is 1391287. The next prime is 1391317. The reversal of 1391291 is 1921931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1921931 = 11 ⋅174721.

It is a cyclic number.

It is not a de Polignac number, because 1391291 - 2² = 1391287 is a prime.

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 1391291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63230 + ... + 63251.

It is an arithmetic number, because the mean of its divisors is an integer number (379446).

2^1391291 is an apocalyptic number.

1391291 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1391291 is a deficient number, since it is larger than the sum of its proper divisors (126493).

1391291 is a wasteful number, since it uses less digits than its factorization.

1391291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126492.

The product of its digits is 486, while the sum is 26.

The square root of 1391291 is about 1179.5299911405. The cubic root of 1391291 is about 111.6364433936.

The spelling of 1391291 in words is "one million, three hundred ninety-one thousand, two hundred ninety-one".