16131618 has 12 divisors (see below), whose sum is σ = 34951878. Its totient is φ = 5377200.

The previous prime is 16131617. The next prime is 16131637. The reversal of 16131618 is 81613161.

16131618 is a `hidden beast` number, since 16 + 1 + 31 + 618 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13593969 + 2537649 = 3687^2 + 1593^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16131591 and 16131600.

It is not an unprimeable number, because it can be changed into a prime (16131611) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 448083 + ... + 448118.

Almost surely, 2^16131618 is an apocalyptic number.

16131618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16131618 is an abundant number, since it is smaller than the sum of its proper divisors (18820260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16131618 is a wasteful number, since it uses less digits than its factorization.

16131618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896209 (or 896206 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 16131618 is about 4016.4185538860. The cubic root of 16131618 is about 252.6732751764.

Adding to 16131618 its reverse (81613161), we get a palindrome (97744779).

The spelling of 16131618 in words is "sixteen million, one hundred thirty-one thousand, six hundred eighteen".