551329321 has 2 divisors, whose sum is σ = 551329322. Its totient is φ = 551329320.

The previous prime is 551329319. The next prime is 551329357. The reversal of 551329321 is 123923155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486687721 + 64641600 = 22061^2 + 8040^2 .

It is a cyclic number.

It is not a de Polignac number, because 551329321 - 2¹ = 551329319 is a prime.

Together with 551329319, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (551329381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275664660 + 275664661.

It is an arithmetic number, because the mean of its divisors is an integer number (275664661).

Almost surely, 2^551329321 is an apocalyptic number.

It is an amenable number.

551329321 is a deficient number, since it is larger than the sum of its proper divisors (1).

551329321 is an equidigital number, since it uses as much as digits as its factorization.

551329321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 31.

The square root of 551329321 is about 23480.4029139195. The cubic root of 551329321 is about 819.9808249532.

The spelling of 551329321 in words is "five hundred fifty-one million, three hundred twenty-nine thousand, three hundred twenty-one".