51405525 has 18 divisors (see below), whose sum is σ = 92073410. Its totient is φ = 27416160.

The previous prime is 51405521. The next prime is 51405527. The reversal of 51405525 is 52550415.

It can be written as a sum of positive squares in 3 ways, for example, as 10150596 + 41254929 = 3186^2 + 6423^2 .

It is not a de Polignac number, because 51405525 - 2² = 51405521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51405521) 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 17 ways as a sum of consecutive naturals, for example, 114010 + ... + 114459.

Almost surely, 2^51405525 is an apocalyptic number.

It is an amenable number.

51405525 is a deficient number, since it is larger than the sum of its proper divisors (40667885).

51405525 is a wasteful number, since it uses less digits than its factorization.

51405525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228485 (or 228477 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 51405525 is about 7169.7646404886. The cubic root of 51405525 is about 371.8232988407.

The spelling of 51405525 in words is "fifty-one million, four hundred five thousand, five hundred twenty-five".