729755861 has 2 divisors, whose sum is σ = 729755862. Its totient is φ = 729755860.

The previous prime is 729755827. The next prime is 729755879. The reversal of 729755861 is 168557927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 707240836 + 22515025 = 26594^2 + 4745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-729755861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729755461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364877930 + 364877931.

It is an arithmetic number, because the mean of its divisors is an integer number (364877931).

Almost surely, 2^729755861 is an apocalyptic number.

It is an amenable number.

729755861 is a deficient number, since it is larger than the sum of its proper divisors (1).

729755861 is an equidigital number, since it uses as much as digits as its factorization.

729755861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 50.

The square root of 729755861 is about 27013.9937995107. The cubic root of 729755861 is about 900.3109464663.

The spelling of 729755861 in words is "seven hundred twenty-nine million, seven hundred fifty-five thousand, eight hundred sixty-one".