5251366321 has 2 divisors, whose sum is σ = 5251366322. Its totient is φ = 5251366320.

The previous prime is 5251366297. The next prime is 5251366343. The reversal of 5251366321 is 1236631525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5251176225 + 190096 = 72465^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 5251366321 - 2⁹ = 5251365809 is a prime.

It is not a weakly prime, because it can be changed into another prime (5251366361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625683160 + 2625683161.

It is an arithmetic number, because the mean of its divisors is an integer number (2625683161).

Almost surely, 2^5251366321 is an apocalyptic number.

It is an amenable number.

5251366321 is a deficient number, since it is larger than the sum of its proper divisors (1).

5251366321 is an equidigital number, since it uses as much as digits as its factorization.

5251366321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 34.

The square root of 5251366321 is about 72466.3116282318. The cubic root of 5251366321 is about 1738.1640829591.

Adding to 5251366321 its reverse (1236631525), we get a palindrome (6487997846).

The spelling of 5251366321 in words is "five billion, two hundred fifty-one million, three hundred sixty-six thousand, three hundred twenty-one".