231315533 has 4 divisors (see below), whose sum is σ = 236695008. Its totient is φ = 225936060.

The previous prime is 231315523. The next prime is 231315587. The reversal of 231315533 is 335513132.

231315533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231315533 - 2⁴ = 231315517 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 (231315523) 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, 2689673 + ... + 2689758.

It is an arithmetic number, because the mean of its divisors is an integer number (59173752).

Almost surely, 2^231315533 is an apocalyptic number.

It is an amenable number.

231315533 is a deficient number, since it is larger than the sum of its proper divisors (5379475).

231315533 is an equidigital number, since it uses as much as digits as its factorization.

231315533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5379474.

The product of its digits is 4050, while the sum is 26.

The square root of 231315533 is about 15209.0608848804. The cubic root of 231315533 is about 613.8584884330.

Adding to 231315533 its reverse (335513132), we get a palindrome (566828665).

The spelling of 231315533 in words is "two hundred thirty-one million, three hundred fifteen thousand, five hundred thirty-three".