51601818 has 16 divisors (see below), whose sum is σ = 103862880. Its totient is φ = 17090736.

The previous prime is 51601793. The next prime is 51601843. The reversal of 51601818 is 81810615.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51601793) and next prime (51601843).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26448 + ... + 28331.

It is an arithmetic number, because the mean of its divisors is an integer number (6491430).

Almost surely, 2^51601818 is an apocalyptic number.

51601818 is an abundant number, since it is smaller than the sum of its proper divisors (52261062).

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

51601818 is a wasteful number, since it uses less digits than its factorization.

51601818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54941.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 51601818 is about 7183.4405405766. The cubic root of 51601818 is about 372.2959692232.

The spelling of 51601818 in words is "fifty-one million, six hundred one thousand, eight hundred eighteen".