51016321 has 2 divisors, whose sum is σ = 51016322. Its totient is φ = 51016320.

The previous prime is 51016319. The next prime is 51016331. The reversal of 51016321 is 12361015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 2852721 = 6940^2 + 1689^2 .

It is a cyclic number.

It is not a de Polignac number, because 51016321 - 2¹ = 51016319 is a prime.

Together with 51016319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51016331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25508160 + 25508161.

It is an arithmetic number, because the mean of its divisors is an integer number (25508161).

Almost surely, 2^51016321 is an apocalyptic number.

It is an amenable number.

51016321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51016321 is an equidigital number, since it uses as much as digits as its factorization.

51016321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 51016321 is about 7142.5710356986. The cubic root of 51016321 is about 370.8825317155.

Adding to 51016321 its reverse (12361015), we get a palindrome (63377336).

The spelling of 51016321 in words is "fifty-one million, sixteen thousand, three hundred twenty-one".