231520166 has 8 divisors (see below), whose sum is σ = 359255520. Its totient is φ = 111768328.

The previous prime is 231520129. The next prime is 231520171. The reversal of 231520166 is 661025132.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1995806 + ... + 1995921.

It is an arithmetic number, because the mean of its divisors is an integer number (44906940).

Almost surely, 2^231520166 is an apocalyptic number.

231520166 is a deficient number, since it is larger than the sum of its proper divisors (127735354).

231520166 is a wasteful number, since it uses less digits than its factorization.

231520166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991758.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 231520166 is about 15215.7867361501. The cubic root of 231520166 is about 614.0394514646.

Adding to 231520166 its reverse (661025132), we get a palindrome (892545298).

The spelling of 231520166 in words is "two hundred thirty-one million, five hundred twenty thousand, one hundred sixty-six".