8161618 has 8 divisors (see below), whose sum is σ = 12637440. Its totient is φ = 3949140.

The previous prime is 8161607. The next prime is 8161627.

It is a happy number.

8161618 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×8161618² = 133224016755848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

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

It is a self number, because there is not a number n which added to its sum of digits gives 8161618.

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 3 ways as a sum of consecutive naturals, for example, 65758 + ... + 65881.

It is an arithmetic number, because the mean of its divisors is an integer number (1579680).

Almost surely, 2^8161618 is an apocalyptic number.

8161618 is a deficient number, since it is larger than the sum of its proper divisors (4475822).

8161618 is a wasteful number, since it uses less digits than its factorization.

8161618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131672.

The product of its digits is 2304, while the sum is 31.

The square root of 8161618 is about 2856.8545640267. The cubic root of 8161618 is about 201.3378475322.

The spelling of 8161618 in words is "eight million, one hundred sixty-one thousand, six hundred eighteen".