61618 has 4 divisors (see below), whose sum is σ = 92430. Its totient is φ = 30808.

The previous prime is 61613. The next prime is 61627. The reversal of 61618 is 81616.

61618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 42849 + 18769 = 207^2 + 137^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (61613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15403 + ... + 15406.

2⁶¹⁶¹⁸ is an apocalyptic number.

61618 is a deficient number, since it is larger than the sum of its proper divisors (30812).

61618 is a wasteful number, since it uses less digits than its factorization.

61618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30811.

The product of its digits is 288, while the sum is 22.

The square root of 61618 is about 248.2297323046. The cubic root of 61618 is about 39.4974628504.

The spelling of 61618 in words is "sixty-one thousand, six hundred eighteen".