231513530 has 8 divisors (see below), whose sum is σ = 416724372. Its totient is φ = 92605408.

The previous prime is 231513523. The next prime is 231513533. The reversal of 231513530 is 35315132.

It can be written as a sum of positive squares in 2 ways, for example, as 227738281 + 3775249 = 15091^2 + 1943^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 231513496 and 231513505.

It is not an unprimeable number, because it can be changed into a prime (231513533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11575667 + ... + 11575686.

Almost surely, 2^231513530 is an apocalyptic number.

231513530 is a deficient number, since it is larger than the sum of its proper divisors (185210842).

231513530 is a wasteful number, since it uses less digits than its factorization.

231513530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23151360.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 231513530 is about 15215.5686715942. The cubic root of 231513530 is about 614.0335847262.

Adding to 231513530 its reverse (35315132), we get a palindrome (266828662).

The spelling of 231513530 in words is "two hundred thirty-one million, five hundred thirteen thousand, five hundred thirty".