51530521 has 4 divisors (see below), whose sum is σ = 58892032. Its totient is φ = 44169012.

The previous prime is 51530473. The next prime is 51530533. The reversal of 51530521 is 12503515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51530521 - 2⁷ = 51530393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51530492 and 51530501.

It is not an unprimeable number, because it can be changed into a prime (51530321) 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 3 ways as a sum of consecutive naturals, for example, 3680745 + ... + 3680758.

It is an arithmetic number, because the mean of its divisors is an integer number (14723008).

Almost surely, 2^51530521 is an apocalyptic number.

It is an amenable number.

51530521 is a deficient number, since it is larger than the sum of its proper divisors (7361511).

51530521 is an equidigital number, since it uses as much as digits as its factorization.

51530521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7361510.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 51530521 is about 7178.4762310674. The cubic root of 51530521 is about 372.1244260424.

The spelling of 51530521 in words is "fifty-one million, five hundred thirty thousand, five hundred twenty-one".