731666731 has 8 divisors (see below), whose sum is σ = 765480960. Its totient is φ = 698019432.

The previous prime is 731666699. The next prime is 731666753. The reversal of 731666731 is 137666137.

It is a happy number.

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 731666731 - 2⁵ = 731666699 is a prime.

It is a super-2 number, since 2×731666731² = 1070672410504452722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731661731) 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, 32721 + ... + 50338.

It is an arithmetic number, because the mean of its divisors is an integer number (95685120).

Almost surely, 2^731666731 is an apocalyptic number.

731666731 is a deficient number, since it is larger than the sum of its proper divisors (33814229).

731666731 is a wasteful number, since it uses less digits than its factorization.

731666731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83465.

The product of its digits is 95256, while the sum is 40.

The square root of 731666731 is about 27049.3388274094. The cubic root of 731666731 is about 901.0960847319.

It can be divided in two parts, 73166 and 6731, that added together give a palindrome (79897).

The spelling of 731666731 in words is "seven hundred thirty-one million, six hundred sixty-six thousand, seven hundred thirty-one".