51452221 has 4 divisors (see below), whose sum is σ = 51598332. Its totient is φ = 51306112.

The previous prime is 51452213. The next prime is 51452227. The reversal of 51452221 is 12225415.

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 36905625 + 14546596 = 6075^2 + 3814^2 .

It is a cyclic number.

It is not a de Polignac number, because 51452221 - 2³ = 51452213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51452192 and 51452201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51452227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72526 + ... + 73231.

It is an arithmetic number, because the mean of its divisors is an integer number (12899583).

Almost surely, 2^51452221 is an apocalyptic number.

It is an amenable number.

51452221 is a deficient number, since it is larger than the sum of its proper divisors (146111).

51452221 is a wasteful number, since it uses less digits than its factorization.

51452221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146110.

The product of its digits is 800, while the sum is 22.

The square root of 51452221 is about 7173.0203540768. The cubic root of 51452221 is about 371.9358509843.

Adding to 51452221 its reverse (12225415), we get a palindrome (63677636).

The spelling of 51452221 in words is "fifty-one million, four hundred fifty-two thousand, two hundred twenty-one".