1121729 has 16 divisors (see below), whose sum is σ = 1357056. Its totient is φ = 907200.

The previous prime is 1121723. The next prime is 1121737. The reversal of 1121729 is 9271211.

It is a de Polignac number, because none of the positive numbers 2^k-1121729 is a prime.

It is a super-3 number, since 3×1121729³ = 4234333867471510467, which 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 (1121723) 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, 15764 + ... + 15834.

It is an arithmetic number, because the mean of its divisors is an integer number (84816).

2^1121729 is an apocalyptic number.

It is an amenable number.

1121729 is a deficient number, since it is larger than the sum of its proper divisors (235327).

1121729 is an equidigital number, since it uses as much as digits as its factorization.

1121729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176.

The product of its digits is 252, while the sum is 23.

The square root of 1121729 is about 1059.1170851233. The cubic root of 1121729 is about 103.9032939800.

The spelling of 1121729 in words is "one million, one hundred twenty-one thousand, seven hundred twenty-nine".