51561022 has 8 divisors (see below), whose sum is σ = 81412200. Its totient is φ = 24423624.

The previous prime is 51560987. The next prime is 51561031. The reversal of 51561022 is 22016515.

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

It is a junction number, because it is equal to n+sod(n) for n = 51560984 and 51561002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678397 + ... + 678472.

It is an arithmetic number, because the mean of its divisors is an integer number (10176525).

Almost surely, 2^51561022 is an apocalyptic number.

51561022 is a deficient number, since it is larger than the sum of its proper divisors (29851178).

51561022 is a wasteful number, since it uses less digits than its factorization.

51561022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356890.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 51561022 is about 7180.6003927248. The cubic root of 51561022 is about 372.1978319142.

Adding to 51561022 its reverse (22016515), we get a palindrome (73577537).

The spelling of 51561022 in words is "fifty-one million, five hundred sixty-one thousand, twenty-two".