1165271959 has 4 divisors (see below), whose sum is σ = 1184374840. Its totient is φ = 1146169080.

The previous prime is 1165271941. The next prime is 1165271963. The reversal of 1165271959 is 9591725611.

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

It is a cyclic number.

It is not a de Polignac number, because 1165271959 - 2⁷ = 1165271831 is a prime.

It is a super-3 number, since 3×1165271959³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165271909) 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, 9551349 + ... + 9551470.

It is an arithmetic number, because the mean of its divisors is an integer number (296093710).

Almost surely, 2^1165271959 is an apocalyptic number.

1165271959 is a deficient number, since it is larger than the sum of its proper divisors (19102881).

1165271959 is an equidigital number, since it uses as much as digits as its factorization.

1165271959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19102880.

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

The square root of 1165271959 is about 34136.0800180689. The cubic root of 1165271959 is about 1052.3069335161.

The spelling of 1165271959 in words is "one billion, one hundred sixty-five million, two hundred seventy-one thousand, nine hundred fifty-nine".