51521128 has 8 divisors (see below), whose sum is σ = 96602130. Its totient is φ = 25760560.

The previous prime is 51521117. The next prime is 51521147. The reversal of 51521128 is 82112515.

It can be written as a sum of positive squares in only one way, i.e., 30891364 + 20629764 = 5558^2 + 4542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220063 + ... + 3220078.

Almost surely, 2^51521128 is an apocalyptic number.

It is an amenable number.

51521128 is a deficient number, since it is larger than the sum of its proper divisors (45081002).

51521128 is a wasteful number, since it uses less digits than its factorization.

51521128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6440147 (or 6440143 counting only the distinct ones).

The product of its digits is 800, while the sum is 25.

The square root of 51521128 is about 7177.8219537684. The cubic root of 51521128 is about 372.1018143483.

The spelling of 51521128 in words is "fifty-one million, five hundred twenty-one thousand, one hundred twenty-eight".