729556991 has 2 divisors, whose sum is σ = 729556992. Its totient is φ = 729556990.

The previous prime is 729556967. The next prime is 729557027. The reversal of 729556991 is 199655927.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-729556991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729556291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364778495 + 364778496.

It is an arithmetic number, because the mean of its divisors is an integer number (364778496).

Almost surely, 2^729556991 is an apocalyptic number.

729556991 is a deficient number, since it is larger than the sum of its proper divisors (1).

729556991 is an equidigital number, since it uses as much as digits as its factorization.

729556991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1530900, while the sum is 53.

The square root of 729556991 is about 27010.3126786789. The cubic root of 729556991 is about 900.2291560511.

The spelling of 729556991 in words is "seven hundred twenty-nine million, five hundred fifty-six thousand, nine hundred ninety-one".