1164331391 has 4 divisors (see below), whose sum is σ = 1169552832. Its totient is φ = 1159109952.

The previous prime is 1164331379. The next prime is 1164331393. The reversal of 1164331391 is 1931334611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1164331391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1164331393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2610386 + ... + 2610831.

It is an arithmetic number, because the mean of its divisors is an integer number (292388208).

Almost surely, 2^1164331391 is an apocalyptic number.

1164331391 is a deficient number, since it is larger than the sum of its proper divisors (5221441).

1164331391 is an equidigital number, since it uses as much as digits as its factorization.

1164331391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5221440.

The product of its digits is 5832, while the sum is 32.

The square root of 1164331391 is about 34122.3004939585. The cubic root of 1164331391 is about 1052.0237284836.

It can be divided in two parts, 11643 and 31391, that added together give a palindrome (43034).

The spelling of 1164331391 in words is "one billion, one hundred sixty-four million, three hundred thirty-one thousand, three hundred ninety-one".