231566406 has 8 divisors (see below), whose sum is σ = 463132824. Its totient is φ = 77188800.

The previous prime is 231566353. The next prime is 231566407. The reversal of 231566406 is 604665132.

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

231566406 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231566407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19297195 + ... + 19297206.

It is an arithmetic number, because the mean of its divisors is an integer number (57891603).

Almost surely, 2^231566406 is an apocalyptic number.

231566406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

231566406 is a wasteful number, since it uses less digits than its factorization.

231566406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38594406.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 231566406 is about 15217.3061347927. The cubic root of 231566406 is about 614.0803280970.

The spelling of 231566406 in words is "two hundred thirty-one million, five hundred sixty-six thousand, four hundred six".