51975521 has 8 divisors (see below), whose sum is σ = 56351400. Its totient is φ = 47653632.

The previous prime is 51975487. The next prime is 51975529. The reversal of 51975521 is 12557915.

It can be written as a sum of positive squares in 4 ways, for example, as 3478225 + 48497296 = 1865^2 + 6964^2 .

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

It is not a de Polignac number, because 51975521 - 2¹⁰ = 51974497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51975529) 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 7 ways as a sum of consecutive naturals, for example, 11480 + ... + 15353.

It is an arithmetic number, because the mean of its divisors is an integer number (7043925).

Almost surely, 2^51975521 is an apocalyptic number.

It is an amenable number.

51975521 is a deficient number, since it is larger than the sum of its proper divisors (4375879).

51975521 is a wasteful number, since it uses less digits than its factorization.

51975521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26995.

The product of its digits is 15750, while the sum is 35.

The square root of 51975521 is about 7209.4050378655. The cubic root of 51975521 is about 373.1925371679.

The spelling of 51975521 in words is "fifty-one million, nine hundred seventy-five thousand, five hundred twenty-one".