551023321 has 2 divisors, whose sum is σ = 551023322. Its totient is φ = 551023320.

The previous prime is 551023289. The next prime is 551023327. The reversal of 551023321 is 123320155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 547560000 + 3463321 = 23400^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 551023321 - 2⁵ = 551023289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 551023292 and 551023301.

It is not a weakly prime, because it can be changed into another prime (551023327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275511660 + 275511661.

It is an arithmetic number, because the mean of its divisors is an integer number (275511661).

Almost surely, 2^551023321 is an apocalyptic number.

It is an amenable number.

551023321 is a deficient number, since it is larger than the sum of its proper divisors (1).

551023321 is an equidigital number, since it uses as much as digits as its factorization.

551023321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 551023321 is about 23473.8859373560. The cubic root of 551023321 is about 819.8290943642.

Adding to 551023321 its reverse (123320155), we get a palindrome (674343476).

The spelling of 551023321 in words is "five hundred fifty-one million, twenty-three thousand, three hundred twenty-one".