231530 has 24 divisors (see below), whose sum is σ = 454572. Its totient is φ = 84864.

The previous prime is 231529. The next prime is 231533. The reversal of 231530 is 35132.

It can be written as a sum of positive squares in 6 ways, for example, as 29929 + 201601 = 173^2 + 449^2 .

It is a super-2 number, since 2×231530² = 107212281800, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231530.

It is not an unprimeable number, because it can be changed into a prime (231533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1622 + ... + 1758.

2²³¹⁵³⁰ is an apocalyptic number.

231530 is a deficient number, since it is larger than the sum of its proper divisors (223042).

231530 is a wasteful number, since it uses less digits than its factorization.

231530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 231530 is about 481.1756436064. The cubic root of 231530 is about 61.4048145277.

Adding to 231530 its reverse (35132), we get a palindrome (266662).

The spelling of 231530 in words is "two hundred thirty-one thousand, five hundred thirty".