1164391 has 4 divisors (see below), whose sum is σ = 1201984. Its totient is φ = 1126800.

The previous prime is 1164367. The next prime is 1164409. The reversal of 1164391 is 1934611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1934611 = 7 ⋅276373.

It is a cyclic number.

It is not a de Polignac number, because 1164391 - 2⁹ = 1163879 is a prime.

It is a Duffinian number.

1164391 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1164091) 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, 18750 + ... + 18811.

It is an arithmetic number, because the mean of its divisors is an integer number (300496).

2^1164391 is an apocalyptic number.

1164391 is a deficient number, since it is larger than the sum of its proper divisors (37593).

1164391 is an equidigital number, since it uses as much as digits as its factorization.

1164391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37592.

The product of its digits is 648, while the sum is 25.

The square root of 1164391 is about 1079.0695065657. The cubic root of 1164391 is about 105.2041681280.

The spelling of 1164391 in words is "one million, one hundred sixty-four thousand, three hundred ninety-one".