731443813 has 4 divisors (see below), whose sum is σ = 749283948. Its totient is φ = 713603680.

The previous prime is 731443807. The next prime is 731443873. The reversal of 731443813 is 318344137.

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

It can be written as a sum of positive squares in 2 ways, for example, as 302829604 + 428614209 = 17402^2 + 20703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731443813 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 (731443873) 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, 8920006 + ... + 8920087.

It is an arithmetic number, because the mean of its divisors is an integer number (187320987).

Almost surely, 2^731443813 is an apocalyptic number.

It is an amenable number.

731443813 is a deficient number, since it is larger than the sum of its proper divisors (17840135).

731443813 is a wasteful number, since it uses less digits than its factorization.

731443813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17840134.

The product of its digits is 24192, while the sum is 34.

The square root of 731443813 is about 27045.2179321964. The cubic root of 731443813 is about 901.0045626714.

The spelling of 731443813 in words is "seven hundred thirty-one million, four hundred forty-three thousand, eight hundred thirteen".