51258521 has 4 divisors (see below), whose sum is σ = 51980544. Its totient is φ = 50536500.

The previous prime is 51258511. The next prime is 51258527. The reversal of 51258521 is 12585215.

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 a de Polignac number, because none of the positive numbers 2^k-51258521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51258527) 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, 360905 + ... + 361046.

It is an arithmetic number, because the mean of its divisors is an integer number (12995136).

Almost surely, 2^51258521 is an apocalyptic number.

It is an amenable number.

51258521 is a deficient number, since it is larger than the sum of its proper divisors (722023).

51258521 is an equidigital number, since it uses as much as digits as its factorization.

51258521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722022.

The product of its digits is 4000, while the sum is 29.

The square root of 51258521 is about 7159.5056393581. The cubic root of 51258521 is about 371.4685269993.

The spelling of 51258521 in words is "fifty-one million, two hundred fifty-eight thousand, five hundred twenty-one".