231320237 has 8 divisors (see below), whose sum is σ = 237205752. Its totient is φ = 225446400.

The previous prime is 231320227. The next prime is 231320251. The reversal of 231320237 is 732023132.

It can be written as a sum of positive squares in 4 ways, for example, as 5900041 + 225420196 = 2429^2 + 15014^2 .

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 231320237 - 2¹⁶ = 231254701 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 (231320227) 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, 48437 + ... + 52997.

It is an arithmetic number, because the mean of its divisors is an integer number (29650719).

Almost surely, 2^231320237 is an apocalyptic number.

It is an amenable number.

231320237 is a deficient number, since it is larger than the sum of its proper divisors (5885515).

231320237 is a wasteful number, since it uses less digits than its factorization.

231320237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5839.

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 231320237 is about 15209.2155287510. The cubic root of 231320237 is about 613.8626495179.

Adding to 231320237 its reverse (732023132), we get a palindrome (963343369).

The spelling of 231320237 in words is "two hundred thirty-one million, three hundred twenty thousand, two hundred thirty-seven".