12161618 has 32 divisors (see below), whose sum is σ = 21980160. Its totient is φ = 4934160.

The previous prime is 12161599. The next prime is 12161623. The reversal of 12161618 is 81616121.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57533 + ... + 57743.

It is an arithmetic number, because the mean of its divisors is an integer number (686880).

Almost surely, 2^12161618 is an apocalyptic number.

12161618 is a deficient number, since it is larger than the sum of its proper divisors (9818542).

12161618 is a wasteful number, since it uses less digits than its factorization.

12161618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422.

The product of its digits is 576, while the sum is 26.

The square root of 12161618 is about 3487.3511437766. The cubic root of 12161618 is about 229.9660819549.

Adding to 12161618 its reverse (81616121), we get a palindrome (93777739).

The spelling of 12161618 in words is "twelve million, one hundred sixty-one thousand, six hundred eighteen".