1165215979 has 4 divisors (see below), whose sum is σ = 1167453000. Its totient is φ = 1162978960.

The previous prime is 1165215967. The next prime is 1165216009. The reversal of 1165215979 is 9795125611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9795125611 = 64171 ⋅152641.

It is a cyclic number.

It is not a de Polignac number, because 1165215979 - 2⁷ = 1165215851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165215959) 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, 1117729 + ... + 1118770.

It is an arithmetic number, because the mean of its divisors is an integer number (291863250).

Almost surely, 2^1165215979 is an apocalyptic number.

1165215979 is a deficient number, since it is larger than the sum of its proper divisors (2237021).

1165215979 is an equidigital number, since it uses as much as digits as its factorization.

1165215979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237020.

The product of its digits is 170100, while the sum is 46.

The square root of 1165215979 is about 34135.2600546707. The cubic root of 1165215979 is about 1052.2900822037.

It can be divided in two parts, 116521 and 5979, that added together give a square (122500 = 350²).

The spelling of 1165215979 in words is "one billion, one hundred sixty-five million, two hundred fifteen thousand, nine hundred seventy-nine".