231530561 has 8 divisors (see below), whose sum is σ = 246230880. Its totient is φ = 217081728.

The previous prime is 231530557. The next prime is 231530587. The reversal of 231530561 is 165035132.

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 231530561 - 2² = 231530557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231530561.

It is not an unprimeable number, because it can be changed into a prime (231530501) 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, 60971 + ... + 64656.

It is an arithmetic number, because the mean of its divisors is an integer number (30778860).

Almost surely, 2^231530561 is an apocalyptic number.

It is an amenable number.

231530561 is a deficient number, since it is larger than the sum of its proper divisors (14700319).

231530561 is a wasteful number, since it uses less digits than its factorization.

231530561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125743.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 231530561 is about 15216.1283183338. The cubic root of 231530561 is about 614.0486412250.

Adding to 231530561 its reverse (165035132), we get a palindrome (396565693).

The spelling of 231530561 in words is "two hundred thirty-one million, five hundred thirty thousand, five hundred sixty-one".