1149391 has 4 divisors (see below), whose sum is σ = 1157800. Its totient is φ = 1140984.

The previous prime is 1149373. The next prime is 1149403. The reversal of 1149391 is 1939411.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1939411 = 17 ⋅114083.

It is a cyclic number.

It is not a de Polignac number, because 1149391 - 2⁹ = 1148879 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1149341) 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, 3996 + ... + 4273.

It is an arithmetic number, because the mean of its divisors is an integer number (289450).

2^1149391 is an apocalyptic number.

1149391 is a deficient number, since it is larger than the sum of its proper divisors (8409).

1149391 is an equidigital number, since it uses as much as digits as its factorization.

1149391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8408.

The product of its digits is 972, while the sum is 28.

The square root of 1149391 is about 1072.0965441601. The cubic root of 1149391 is about 104.7504580534.

It can be divided in two parts, 1149 and 391, that added together give a triangular number (1540 = T₅₅).

The spelling of 1149391 in words is "one million, one hundred forty-nine thousand, three hundred ninety-one".