729117131 has 8 divisors (see below), whose sum is σ = 786573504. Its totient is φ = 673279360.

The previous prime is 729117083. The next prime is 729117143. The reversal of 729117131 is 131711927.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 729117131 - 2¹⁰ = 729116107 is a prime.

It is a super-2 number, since 2×729117131² = 1063223581435342322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (729117161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403715 + ... + 405516.

It is an arithmetic number, because the mean of its divisors is an integer number (98321688).

Almost surely, 2^729117131 is an apocalyptic number.

729117131 is a deficient number, since it is larger than the sum of its proper divisors (57456373).

729117131 is a wasteful number, since it uses less digits than its factorization.

729117131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809301.

The product of its digits is 2646, while the sum is 32.

The square root of 729117131 is about 27002.1690054707. The cubic root of 729117131 is about 900.0481994762.

The spelling of 729117131 in words is "seven hundred twenty-nine million, one hundred seventeen thousand, one hundred thirty-one".