51528561 has 32 divisors (see below), whose sum is σ = 81312768. Its totient is φ = 28416960.

The previous prime is 51528559. The next prime is 51528571. The reversal of 51528561 is 16582515.

It is not a de Polignac number, because 51528561 - 2¹ = 51528559 is a prime.

It is a super-3 number, since 3×51528561³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51528511) 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 31 ways as a sum of consecutive naturals, for example, 74226 + ... + 74916.

It is an arithmetic number, because the mean of its divisors is an integer number (2541024).

Almost surely, 2^51528561 is an apocalyptic number.

It is an amenable number.

51528561 is a deficient number, since it is larger than the sum of its proper divisors (29784207).

51528561 is a wasteful number, since it uses less digits than its factorization.

51528561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821.

The product of its digits is 12000, while the sum is 33.

The square root of 51528561 is about 7178.3397105459. The cubic root of 51528561 is about 372.1197079768.

The spelling of 51528561 in words is "fifty-one million, five hundred twenty-eight thousand, five hundred sixty-one".