51521166 has 24 divisors (see below), whose sum is σ = 111763080. Its totient is φ = 17153136.

The previous prime is 51521161. The next prime is 51521177. The reversal of 51521166 is 66112515.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521161) 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 11 ways as a sum of consecutive naturals, for example, 24721 + ... + 26723.

It is an arithmetic number, because the mean of its divisors is an integer number (4656795).

Almost surely, 2^51521166 is an apocalyptic number.

51521166 is an abundant number, since it is smaller than the sum of its proper divisors (60241914).

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

51521166 is a wasteful number, since it uses less digits than its factorization.

51521166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3440 (or 3437 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 51521166 is about 7177.8246008105. The cubic root of 51521166 is about 372.1019058309.

The spelling of 51521166 in words is "fifty-one million, five hundred twenty-one thousand, one hundred sixty-six".