1232216618 has 4 divisors (see below), whose sum is σ = 1848324930. Its totient is φ = 616108308.

The previous prime is 1232216617. The next prime is 1232216621. The reversal of 1232216618 is 8166122321.

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., 1225210009 + 7006609 = 35003^2 + 2647^2 .

It is not an unprimeable number, because it can be changed into a prime (1232216617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308054153 + ... + 308054156.

Almost surely, 2^1232216618 is an apocalyptic number.

1232216618 is a deficient number, since it is larger than the sum of its proper divisors (616108312).

1232216618 is an equidigital number, since it uses as much as digits as its factorization.

1232216618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616108311.

The product of its digits is 6912, while the sum is 32.

The square root of 1232216618 is about 35102.9431529608. The cubic root of 1232216618 is about 1072.0845083792.

Adding to 1232216618 its reverse (8166122321), we get a palindrome (9398338939).

The spelling of 1232216618 in words is "one billion, two hundred thirty-two million, two hundred sixteen thousand, six hundred eighteen".