51812618 has 32 divisors (see below), whose sum is σ = 94469760. Its totient is φ = 20986560.

The previous prime is 51812611. The next prime is 51812627. The reversal of 51812618 is 81621815.

It is not an unprimeable number, because it can be changed into a prime (51812611) 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 15 ways as a sum of consecutive naturals, for example, 5171 + ... + 11417.

It is an arithmetic number, because the mean of its divisors is an integer number (2952180).

Almost surely, 2^51812618 is an apocalyptic number.

51812618 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

51812618 is a deficient number, since it is larger than the sum of its proper divisors (42657142).

51812618 is a wasteful number, since it uses less digits than its factorization.

51812618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6302.

The product of its digits is 3840, while the sum is 32.

The square root of 51812618 is about 7198.0982210581. The cubic root of 51812618 is about 372.8022392754.

The spelling of 51812618 in words is "fifty-one million, eight hundred twelve thousand, six hundred eighteen".