51548521 has 4 divisors (see below), whose sum is σ = 52805844. Its totient is φ = 50291200.

The previous prime is 51548507. The next prime is 51548537. The reversal of 51548521 is 12584515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4145296 + 47403225 = 2036^2 + 6885^2 .

It is a cyclic number.

It is not a de Polignac number, because 51548521 - 2¹³ = 51540329 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51548821) 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, 628600 + ... + 628681.

It is an arithmetic number, because the mean of its divisors is an integer number (13201461).

Almost surely, 2^51548521 is an apocalyptic number.

It is an amenable number.

51548521 is a deficient number, since it is larger than the sum of its proper divisors (1257323).

51548521 is a wasteful number, since it uses less digits than its factorization.

51548521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257322.

The product of its digits is 8000, while the sum is 31.

The square root of 51548521 is about 7179.7298695703. The cubic root of 51548521 is about 372.1677496221.

The spelling of 51548521 in words is "fifty-one million, five hundred forty-eight thousand, five hundred twenty-one".