231231660 has 48 divisors (see below), whose sum is σ = 706309632. Its totient is φ = 56056000.

The previous prime is 231231613. The next prime is 231231731. The reversal of 231231660 is 66132132.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 231231660.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174516 + ... + 175835.

It is an arithmetic number, because the mean of its divisors is an integer number (14714784).

Almost surely, 2^231231660 is an apocalyptic number.

231231660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231231660 is an abundant number, since it is smaller than the sum of its proper divisors (475077972).

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

231231660 is a wasteful number, since it uses less digits than its factorization.

231231660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350374 (or 350372 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 231231660 is about 15206.3032983036. The cubic root of 231231660 is about 613.7842862146.

Adding to 231231660 its reverse (66132132), we get a palindrome (297363792).

The spelling of 231231660 in words is "two hundred thirty-one million, two hundred thirty-one thousand, six hundred sixty".