731729 has 2 divisors, whose sum is σ = 731730. Its totient is φ = 731728.

The previous prime is 731719. The next prime is 731737. The reversal of 731729 is 927137.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 559504 + 172225 = 748^2 + 415^2 .

It is an emirp because it is prime and its reverse (927137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 731729 - 2⁴ = 731713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (731719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365864 + 365865.

It is an arithmetic number, because the mean of its divisors is an integer number (365865).

2⁷³¹⁷²⁹ is an apocalyptic number.

It is an amenable number.

731729 is a deficient number, since it is larger than the sum of its proper divisors (1).

731729 is an equidigital number, since it uses as much as digits as its factorization.

731729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2646, while the sum is 29.

The square root of 731729 is about 855.4115968351. The cubic root of 731729 is about 90.1121646807.

The spelling of 731729 in words is "seven hundred thirty-one thousand, seven hundred twenty-nine".