51845521 has 8 divisors (see below), whose sum is σ = 63809984. Its totient is φ = 41020560.

The previous prime is 51845503. The next prime is 51845527. The reversal of 51845521 is 12554815.

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

It is not a de Polignac number, because 51845521 - 2⁵ = 51845489 is a prime.

It is a super-4 number, since 4×51845521⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (51845527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284775 + ... + 284956.

It is an arithmetic number, because the mean of its divisors is an integer number (7976248).

Almost surely, 2^51845521 is an apocalyptic number.

It is an amenable number.

51845521 is a deficient number, since it is larger than the sum of its proper divisors (11964463).

51845521 is a wasteful number, since it uses less digits than its factorization.

51845521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569751.

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

The square root of 51845521 is about 7200.3833925701. The cubic root of 51845521 is about 372.8811371510.

The spelling of 51845521 in words is "fifty-one million, eight hundred forty-five thousand, five hundred twenty-one".