121618 has 24 divisors (see below), whose sum is σ = 227772. Its totient is φ = 48384.

The previous prime is 121609. The next prime is 121621. The reversal of 121618 is 816121.

It can be written as a sum of positive squares in 2 ways, for example, as 117649 + 3969 = 343^2 + 63^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 121595 and 121604.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1630 + ... + 1702.

2¹²¹⁶¹⁸ is an apocalyptic number.

121618 is a deficient number, since it is larger than the sum of its proper divisors (106154).

121618 is a wasteful number, since it uses less digits than its factorization.

121618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 99 counting only the distinct ones).

The product of its digits is 96, while the sum is 19.

The square root of 121618 is about 348.7377237983. The cubic root of 121618 is about 49.5449375955.

Adding to 121618 its reverse (816121), we get a palindrome (937739).

The spelling of 121618 in words is "one hundred twenty-one thousand, six hundred eighteen".