51122561 has 8 divisors (see below), whose sum is σ = 58618560. Its totient is φ = 43674768.

The previous prime is 51122551. The next prime is 51122573. The reversal of 51122561 is 16522115.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51122561 - 2¹⁰ = 51121537 is a prime.

It is a super-3 number, since 3×51122561³ (a number of 24 digits) contains 333 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 (51122501) 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, 9746 + ... + 14043.

It is an arithmetic number, because the mean of its divisors is an integer number (7327320).

Almost surely, 2^51122561 is an apocalyptic number.

It is an amenable number.

51122561 is a deficient number, since it is larger than the sum of its proper divisors (7495999).

51122561 is a wasteful number, since it uses less digits than its factorization.

51122561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24103.

The product of its digits is 600, while the sum is 23.

The square root of 51122561 is about 7150.0042657330. The cubic root of 51122561 is about 371.1398038945.

Adding to 51122561 its reverse (16522115), we get a palindrome (67644676).

The spelling of 51122561 in words is "fifty-one million, one hundred twenty-two thousand, five hundred sixty-one".