111431666 has 4 divisors (see below), whose sum is σ = 167147502. Its totient is φ = 55715832.

The previous prime is 111431657. The next prime is 111431669. The reversal of 111431666 is 666134111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 92256025 + 19175641 = 9605^2 + 4379^2 .

It is not an unprimeable number, because it can be changed into a prime (111431669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27857915 + ... + 27857918.

Almost surely, 2^111431666 is an apocalyptic number.

111431666 is a deficient number, since it is larger than the sum of its proper divisors (55715836).

111431666 is an equidigital number, since it uses as much as digits as its factorization.

111431666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55715835.

The product of its digits is 2592, while the sum is 29.

The square root of 111431666 is about 10556.1198363793. The cubic root of 111431666 is about 481.2117330342.

Adding to 111431666 its reverse (666134111), we get a palindrome (777565777).

The spelling of 111431666 in words is "one hundred eleven million, four hundred thirty-one thousand, six hundred sixty-six".