231201660 has 48 divisors (see below), whose sum is σ = 648055296. Its totient is φ = 61588032.

The previous prime is 231201643. The next prime is 231201673. The reversal of 231201660 is 66102132.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85489 + ... + 88151.

It is an arithmetic number, because the mean of its divisors is an integer number (13501152).

Almost surely, 2^231201660 is an apocalyptic number.

231201660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231201660 is an abundant number, since it is smaller than the sum of its proper divisors (416853636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231201660 is a wasteful number, since it uses less digits than its factorization.

231201660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4122 (or 4120 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 231201660 is about 15205.3168332659. The cubic root of 231201660 is about 613.7577409382.

Adding to 231201660 its reverse (66102132), we get a palindrome (297303792).

The spelling of 231201660 in words is "two hundred thirty-one million, two hundred one thousand, six hundred sixty".