51221611 has 12 divisors (see below), whose sum is σ = 59733720. Its totient is φ = 43794240.

The previous prime is 51221593. The next prime is 51221623. The reversal of 51221611 is 11612215.

51221611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51221611 - 2¹³ = 51213419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51225611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22995 + ... + 25123.

It is an arithmetic number, because the mean of its divisors is an integer number (4977810).

Almost surely, 2^51221611 is an apocalyptic number.

51221611 is a deficient number, since it is larger than the sum of its proper divisors (8512109).

51221611 is a wasteful number, since it uses less digits than its factorization.

51221611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634 (or 2627 counting only the distinct ones).

The product of its digits is 120, while the sum is 19.

The square root of 51221611 is about 7156.9274832151. The cubic root of 51221611 is about 371.3793438069.

Adding to 51221611 its reverse (11612215), we get a palindrome (62833826).

The spelling of 51221611 in words is "fifty-one million, two hundred twenty-one thousand, six hundred eleven".