1161729 has 16 divisors (see below), whose sum is σ = 1823040. Its totient is φ = 728640.

The previous prime is 1161703. The next prime is 1161749. The reversal of 1161729 is 9271611.

It is not a de Polignac number, because 1161729 - 2⁹ = 1161217 is a prime.

It is a super-2 number, since 2×1161729² = 2699228538882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

1161729 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1161749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807 + ... + 1724.

It is an arithmetic number, because the mean of its divisors is an integer number (113940).

2^1161729 is an apocalyptic number.

It is an amenable number.

1161729 is a deficient number, since it is larger than the sum of its proper divisors (661311).

1161729 is a wasteful number, since it uses less digits than its factorization.

1161729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557 (or 2551 counting only the distinct ones).

The product of its digits is 756, while the sum is 27.

The square root of 1161729 is about 1077.8353306512. The cubic root of 1161729 is about 105.1239352898.

The spelling of 1161729 in words is "one million, one hundred sixty-one thousand, seven hundred twenty-nine".