231681306 has 16 divisors (see below), whose sum is σ = 464400000. Its totient is φ = 77054208.

The previous prime is 231681239. The next prime is 231681367. The reversal of 231681306 is 603186132.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40306 + ... + 45693.

It is an arithmetic number, because the mean of its divisors is an integer number (29025000).

Almost surely, 2^231681306 is an apocalyptic number.

231681306 is an abundant number, since it is smaller than the sum of its proper divisors (232718694).

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

231681306 is a wasteful number, since it uses less digits than its factorization.

231681306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86453.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 231681306 is about 15221.0809734394. The cubic root of 231681306 is about 614.1818773159.

The spelling of 231681306 in words is "two hundred thirty-one million, six hundred eighty-one thousand, three hundred six".