6551234321 has 2 divisors, whose sum is σ = 6551234322. Its totient is φ = 6551234320.

The previous prime is 6551234317. The next prime is 6551234329. The reversal of 6551234321 is 1234321556.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4825247296 + 1725987025 = 69464^2 + 41545^2 .

It is a cyclic number.

It is not a de Polignac number, because 6551234321 - 2² = 6551234317 is a prime.

It is a super-2 number, since 2×6551234321² = 85837342257296662082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6551234329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3275617160 + 3275617161.

It is an arithmetic number, because the mean of its divisors is an integer number (3275617161).

Almost surely, 2^6551234321 is an apocalyptic number.

It is an amenable number.

6551234321 is a deficient number, since it is larger than the sum of its proper divisors (1).

6551234321 is an equidigital number, since it uses as much as digits as its factorization.

6551234321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 32.

The square root of 6551234321 is about 80939.6955825755. The cubic root of 6551234321 is about 1871.1461532425.

Adding to 6551234321 its reverse (1234321556), we get a palindrome (7785555877).

The spelling of 6551234321 in words is "six billion, five hundred fifty-one million, two hundred thirty-four thousand, three hundred twenty-one".