231813073 has 4 divisors (see below), whose sum is σ = 231974068. Its totient is φ = 231652080.

The previous prime is 231813047. The next prime is 231813077. The reversal of 231813073 is 370318132.

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 166332609 + 65480464 = 12897^2 + 8092^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231813073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231813077) 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, 78318 + ... + 81223.

It is an arithmetic number, because the mean of its divisors is an integer number (57993517).

Almost surely, 2^231813073 is an apocalyptic number.

It is an amenable number.

231813073 is a deficient number, since it is larger than the sum of its proper divisors (160995).

231813073 is a wasteful number, since it uses less digits than its factorization.

231813073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160994.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 231813073 is about 15225.4087958255. The cubic root of 231813073 is about 614.2982923562.

The spelling of 231813073 in words is "two hundred thirty-one million, eight hundred thirteen thousand, seventy-three".