51222631 has 2 divisors, whose sum is σ = 51222632. Its totient is φ = 51222630.

The previous prime is 51222617. The next prime is 51222641. The reversal of 51222631 is 13622215.

51222631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51222631 - 2¹⁹ = 50698343 is a prime.

It is a super-2 number, since 2×51222631² = 5247515853124322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51222641) 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 as a sum of consecutive naturals, namely, 25611315 + 25611316.

It is an arithmetic number, because the mean of its divisors is an integer number (25611316).

Almost surely, 2^51222631 is an apocalyptic number.

51222631 is a deficient number, since it is larger than the sum of its proper divisors (1).

51222631 is an equidigital number, since it uses as much as digits as its factorization.

51222631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 51222631 is about 7156.9987424898. The cubic root of 51222631 is about 371.3818089410.

Adding to 51222631 its reverse (13622215), we get a palindrome (64844846).

The spelling of 51222631 in words is "fifty-one million, two hundred twenty-two thousand, six hundred thirty-one".