51626321 has 2 divisors, whose sum is σ = 51626322. Its totient is φ = 51626320.

The previous prime is 51626317. The next prime is 51626369. The reversal of 51626321 is 12362615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39627025 + 11999296 = 6295^2 + 3464^2 .

It is a cyclic number.

It is not a de Polignac number, because 51626321 - 2² = 51626317 is a prime.

It is not a weakly prime, because it can be changed into another prime (51626221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25813160 + 25813161.

It is an arithmetic number, because the mean of its divisors is an integer number (25813161).

Almost surely, 2^51626321 is an apocalyptic number.

It is an amenable number.

51626321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51626321 is an equidigital number, since it uses as much as digits as its factorization.

51626321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 51626321 is about 7185.1458579489. The cubic root of 51626321 is about 372.3548878489.

Adding to 51626321 its reverse (12362615), we get a palindrome (63988936).

The spelling of 51626321 in words is "fifty-one million, six hundred twenty-six thousand, three hundred twenty-one".