731716561 has 8 divisors (see below), whose sum is σ = 736002944. Its totient is φ = 727438320.

The previous prime is 731716547. The next prime is 731716571. The reversal of 731716561 is 165617137.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731716561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 731716561.

It is not an unprimeable number, because it can be changed into a prime (731716511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299035 + ... + 301471.

It is an arithmetic number, because the mean of its divisors is an integer number (92000368).

Almost surely, 2^731716561 is an apocalyptic number.

It is an amenable number.

731716561 is a deficient number, since it is larger than the sum of its proper divisors (4286383).

731716561 is a wasteful number, since it uses less digits than its factorization.

731716561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4071.

The product of its digits is 26460, while the sum is 37.

The square root of 731716561 is about 27050.2599063299. The cubic root of 731716561 is about 901.1165405837.

The spelling of 731716561 in words is "seven hundred thirty-one million, seven hundred sixteen thousand, five hundred sixty-one".