51122321 has 2 divisors, whose sum is σ = 51122322. Its totient is φ = 51122320.

The previous prime is 51122311. The next prime is 51122327. The reversal of 51122321 is 12322115.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26122321 + 25000000 = 5111^2 + 5000^2 .

It is a cyclic number.

It is not a de Polignac number, because 51122321 - 2¹⁸ = 50860177 is a prime.

It is a super-2 number, since 2×51122321² = 5226983408854082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51122321.

It is not a weakly prime, because it can be changed into another prime (51122327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25561160 + 25561161.

It is an arithmetic number, because the mean of its divisors is an integer number (25561161).

Almost surely, 2^51122321 is an apocalyptic number.

It is an amenable number.

51122321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51122321 is an equidigital number, since it uses as much as digits as its factorization.

51122321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 17.

The square root of 51122321 is about 7149.9874825065. The cubic root of 51122321 is about 371.1392231092.

Adding to 51122321 its reverse (12322115), we get a palindrome (63444436).

The spelling of 51122321 in words is "fifty-one million, one hundred twenty-two thousand, three hundred twenty-one".