729317731 has 4 divisors (see below), whose sum is σ = 772218792. Its totient is φ = 686416672.

The previous prime is 729317689. The next prime is 729317761. The reversal of 729317731 is 137713927.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 729317731 - 2¹⁷ = 729186659 is a prime.

It is a super-2 number, since 2×729317731² = 1063808705501976722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (729317761) 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, 21450505 + ... + 21450538.

It is an arithmetic number, because the mean of its divisors is an integer number (193054698).

Almost surely, 2^729317731 is an apocalyptic number.

729317731 is a deficient number, since it is larger than the sum of its proper divisors (42901061).

729317731 is a wasteful number, since it uses less digits than its factorization.

729317731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42901060.

The product of its digits is 55566, while the sum is 40.

The square root of 729317731 is about 27005.8832664292. The cubic root of 729317731 is about 900.1307345065.

The spelling of 729317731 in words is "seven hundred twenty-nine million, three hundred seventeen thousand, seven hundred thirty-one".