51293521 has 4 divisors (see below), whose sum is σ = 53993200. Its totient is φ = 48593844.

The previous prime is 51293491. The next prime is 51293533. The reversal of 51293521 is 12539215.

51293521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51293521 - 2⁷ = 51293393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51293521.

It is not an unprimeable number, because it can be changed into a prime (51293551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1349811 + ... + 1349848.

It is an arithmetic number, because the mean of its divisors is an integer number (13498300).

Almost surely, 2^51293521 is an apocalyptic number.

It is an amenable number.

51293521 is a deficient number, since it is larger than the sum of its proper divisors (2699679).

51293521 is a wasteful number, since it uses less digits than its factorization.

51293521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699678.

The product of its digits is 2700, while the sum is 28.

The square root of 51293521 is about 7161.9495250944. The cubic root of 51293521 is about 371.5530556470.

The spelling of 51293521 in words is "fifty-one million, two hundred ninety-three thousand, five hundred twenty-one".