729991 has 2 divisors, whose sum is σ = 729992. Its totient is φ = 729990.

The previous prime is 729979. The next prime is 730003. The reversal of 729991 is 199927.

729991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (729979) and next prime (730003).

It is a cyclic number.

It is not a de Polignac number, because 729991 - 2¹⁹ = 205703 is a prime.

It is equal to p₅₈₇₈₉ and since 729991 and 58789 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 729991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364995 + 364996.

It is an arithmetic number, because the mean of its divisors is an integer number (364996).

2⁷²⁹⁹⁹¹ is an apocalyptic number.

729991 is a deficient number, since it is larger than the sum of its proper divisors (1).

729991 is an equidigital number, since it uses as much as digits as its factorization.

729991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 37.

The square root of 729991 is about 854.3951076639. The cubic root of 729991 is about 90.0407634274.

The spelling of 729991 in words is "seven hundred twenty-nine thousand, nine hundred ninety-one".