51222361 has 2 divisors, whose sum is σ = 51222362. Its totient is φ = 51222360.

The previous prime is 51222317. The next prime is 51222383. The reversal of 51222361 is 16322215.

It is an a-pointer prime, because the next prime (51222383) can be obtained adding 51222361 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44689225 + 6533136 = 6685^2 + 2556^2 .

It is a cyclic number.

It is not a de Polignac number, because 51222361 - 2¹⁹ = 50698073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51226361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25611180 + 25611181.

It is an arithmetic number, because the mean of its divisors is an integer number (25611181).

Almost surely, 2^51222361 is an apocalyptic number.

It is an amenable number.

51222361 is a deficient number, since it is larger than the sum of its proper divisors (1).

51222361 is an equidigital number, since it uses as much as digits as its factorization.

51222361 is an evil number, because the sum of its binary digits is even.

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

The square root of 51222361 is about 7156.9798798096. The cubic root of 51222361 is about 371.3811564087.

Adding to 51222361 its reverse (16322215), we get a palindrome (67544576).

The spelling of 51222361 in words is "fifty-one million, two hundred twenty-two thousand, three hundred sixty-one".