1165720329 has 24 divisors (see below), whose sum is σ = 1747986240. Its totient is φ = 776344176.

The previous prime is 1165720327. The next prime is 1165720343. The reversal of 1165720329 is 9230275611.

It is not a de Polignac number, because 1165720329 - 2¹ = 1165720327 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1165720293 and 1165720302.

It is not an unprimeable number, because it can be changed into a prime (1165720327) 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 23 ways as a sum of consecutive naturals, for example, 318699 + ... + 322335.

It is an arithmetic number, because the mean of its divisors is an integer number (72832760).

Almost surely, 2^1165720329 is an apocalyptic number.

It is an amenable number.

1165720329 is a deficient number, since it is larger than the sum of its proper divisors (582265911).

1165720329 is an equidigital number, since it uses as much as digits as its factorization.

1165720329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4971 (or 4959 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 1165720329 is about 34142.6467778935. The cubic root of 1165720329 is about 1052.4418840895.

The spelling of 1165720329 in words is "one billion, one hundred sixty-five million, seven hundred twenty thousand, three hundred twenty-nine".