1159391 has 4 divisors (see below), whose sum is σ = 1199400. Its totient is φ = 1119384.

The previous prime is 1159381. The next prime is 1159393. The reversal of 1159391 is 1939511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1939511 = 7 ⋅277073.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1159391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 39979 = 1159391 / (1 + 1 + 5 + 9 + 3 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1159393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19961 + ... + 20018.

It is an arithmetic number, because the mean of its divisors is an integer number (299850).

2^1159391 is an apocalyptic number.

1159391 is a deficient number, since it is larger than the sum of its proper divisors (40009).

1159391 is an equidigital number, since it uses as much as digits as its factorization.

1159391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40008.

The product of its digits is 1215, while the sum is 29.

The square root of 1159391 is about 1076.7502031576. The cubic root of 1159391 is about 105.0533666735.

The spelling of 1159391 in words is "one million, one hundred fifty-nine thousand, three hundred ninety-one".