231541666 has 16 divisors (see below), whose sum is σ = 379607040. Its totient is φ = 105445440.

The previous prime is 231541601. The next prime is 231541669. The reversal of 231541666 is 666145132.

231541666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×231541666² = 107223086188111112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (231541669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108786 + ... + 110893.

It is an arithmetic number, because the mean of its divisors is an integer number (23725440).

Almost surely, 2^231541666 is an apocalyptic number.

231541666 is a deficient number, since it is larger than the sum of its proper divisors (148065374).

231541666 is a wasteful number, since it uses less digits than its factorization.

231541666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219729.

The product of its digits is 25920, while the sum is 34.

The square root of 231541666 is about 15216.4932228158. The cubic root of 231541666 is about 614.0584583612.

Adding to 231541666 its reverse (666145132), we get a palindrome (897686798).

The spelling of 231541666 in words is "two hundred thirty-one million, five hundred forty-one thousand, six hundred sixty-six".