51263321 has 2 divisors, whose sum is σ = 51263322. Its totient is φ = 51263320.

The previous prime is 51263287. The next prime is 51263327. The reversal of 51263321 is 12336215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44689225 + 6574096 = 6685^2 + 2564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51263321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51263327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25631660 + 25631661.

It is an arithmetic number, because the mean of its divisors is an integer number (25631661).

Almost surely, 2^51263321 is an apocalyptic number.

It is an amenable number.

51263321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51263321 is an equidigital number, since it uses as much as digits as its factorization.

51263321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 23.

The square root of 51263321 is about 7159.8408501865. The cubic root of 51263321 is about 371.4801217757.

Adding to 51263321 its reverse (12336215), we get a palindrome (63599536).

The spelling of 51263321 in words is "fifty-one million, two hundred sixty-three thousand, three hundred twenty-one".