51222641 has 2 divisors, whose sum is σ = 51222642. Its totient is φ = 51222640.

The previous prime is 51222631. The next prime is 51222659. The reversal of 51222641 is 14622215.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49773025 + 1449616 = 7055^2 + 1204^2 .

It is a cyclic number.

It is not a de Polignac number, because 51222641 - 2²² = 47028337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51222631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25611320 + 25611321.

It is an arithmetic number, because the mean of its divisors is an integer number (25611321).

Almost surely, 2^51222641 is an apocalyptic number.

It is an amenable number.

51222641 is a deficient number, since it is larger than the sum of its proper divisors (1).

51222641 is an equidigital number, since it uses as much as digits as its factorization.

51222641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 51222641 is about 7156.9994411066. Note that the first 3 decimals coincide. The cubic root of 51222641 is about 371.3818331088.

Adding to 51222641 its reverse (14622215), we get a palindrome (65844856).

The spelling of 51222641 in words is "fifty-one million, two hundred twenty-two thousand, six hundred forty-one".