231217730 has 8 divisors (see below), whose sum is σ = 416191932. Its totient is φ = 92487088.

The previous prime is 231217711. The next prime is 231217739. The reversal of 231217730 is 37712132.

It can be written as a sum of positive squares in 2 ways, for example, as 225690529 + 5527201 = 15023^2 + 2351^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 231217730.

It is not an unprimeable number, because it can be changed into a prime (231217739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11560877 + ... + 11560896.

Almost surely, 2^231217730 is an apocalyptic number.

231217730 is a deficient number, since it is larger than the sum of its proper divisors (184974202).

231217730 is a wasteful number, since it uses less digits than its factorization.

231217730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23121780.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 231217730 is about 15205.8452576633. The cubic root of 231217730 is about 613.7719606435.

Adding to 231217730 its reverse (37712132), we get a palindrome (268929862).

The spelling of 231217730 in words is "two hundred thirty-one million, two hundred seventeen thousand, seven hundred thirty".