51551851 has 8 divisors (see below), whose sum is σ = 56037744. Its totient is φ = 47140320.

The previous prime is 51551849. The next prime is 51551861. The reversal of 51551851 is 15815515.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51551851 - 2¹ = 51551849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51551861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17140 + ... + 19921.

It is an arithmetic number, because the mean of its divisors is an integer number (7004718).

Almost surely, 2^51551851 is an apocalyptic number.

51551851 is a deficient number, since it is larger than the sum of its proper divisors (4485893).

51551851 is a wasteful number, since it uses less digits than its factorization.

51551851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37181.

The product of its digits is 5000, while the sum is 31.

The square root of 51551851 is about 7179.9617687004. The cubic root of 51551851 is about 372.1757633788.

The spelling of 51551851 in words is "fifty-one million, five hundred fifty-one thousand, eight hundred fifty-one".