731661317 has 8 divisors (see below), whose sum is σ = 776497176. Its totient is φ = 687025152.

The previous prime is 731661311. The next prime is 731661323. The reversal of 731661317 is 713166137.

It is an interprime number because it is at equal distance from previous prime (731661311) and next prime (731661323).

It can be written as a sum of positive squares in 4 ways, for example, as 63904036 + 667757281 = 7994^2 + 25841^2 .

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 731661317 - 2⁸ = 731661061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731661311) 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, 42338 + ... + 57059.

It is an arithmetic number, because the mean of its divisors is an integer number (97062147).

Almost surely, 2^731661317 is an apocalyptic number.

It is an amenable number.

731661317 is a deficient number, since it is larger than the sum of its proper divisors (44835859).

731661317 is a wasteful number, since it uses less digits than its factorization.

731661317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99847.

The product of its digits is 15876, while the sum is 35.

The square root of 731661317 is about 27049.2387508410. The cubic root of 731661317 is about 901.0938621598.

The spelling of 731661317 in words is "seven hundred thirty-one million, six hundred sixty-one thousand, three hundred seventeen".