1181729 has 2 divisors, whose sum is σ = 1181730. Its totient is φ = 1181728.

The previous prime is 1181723. The next prime is 1181731. The reversal of 1181729 is 9271811.

1181729 is nontrivially palindromic in base 3, base 4 and base 9.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616225 + 565504 = 785^2 + 752^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181729 - 2⁸ = 1181473 is a prime.

Together with 1181731, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1181723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590864 + 590865.

It is an arithmetic number, because the mean of its divisors is an integer number (590865).

2^1181729 is an apocalyptic number.

It is an amenable number.

1181729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181729 is an equidigital number, since it uses as much as digits as its factorization.

1181729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 29.

The square root of 1181729 is about 1087.0735945648. The cubic root of 1181729 is about 105.7237675415.

The spelling of 1181729 in words is "one million, one hundred eighty-one thousand, seven hundred twenty-nine".