729143081 has 4 divisors (see below), whose sum is σ = 729360132. Its totient is φ = 728926032.

The previous prime is 729143059. The next prime is 729143117. The reversal of 729143081 is 180341927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180341927 = 577 ⋅312551.

It can be written as a sum of positive squares in 2 ways, for example, as 578835481 + 150307600 = 24059^2 + 12260^2 .

It is a cyclic number.

It is not a de Polignac number, because 729143081 - 2⁶ = 729143017 is a prime.

It is a super-2 number, since 2×729143081² = 1063299265140345122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (729143581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103406 + ... + 110231.

It is an arithmetic number, because the mean of its divisors is an integer number (182340033).

Almost surely, 2^729143081 is an apocalyptic number.

It is an amenable number.

729143081 is a deficient number, since it is larger than the sum of its proper divisors (217051).

729143081 is a wasteful number, since it uses less digits than its factorization.

729143081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217050.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 729143081 is about 27002.6495181491. The cubic root of 729143081 is about 900.0588772182.

The spelling of 729143081 in words is "seven hundred twenty-nine million, one hundred forty-three thousand, eighty-one".