551992321 has 2 divisors, whose sum is σ = 551992322. Its totient is φ = 551992320.

The previous prime is 551992319. The next prime is 551992361. The reversal of 551992321 is 123299155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374809600 + 177182721 = 19360^2 + 13311^2 .

It is a cyclic number.

It is not a de Polignac number, because 551992321 - 2¹ = 551992319 is a prime.

Together with 551992319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (551992361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275996160 + 275996161.

It is an arithmetic number, because the mean of its divisors is an integer number (275996161).

Almost surely, 2^551992321 is an apocalyptic number.

It is an amenable number.

551992321 is a deficient number, since it is larger than the sum of its proper divisors (1).

551992321 is an equidigital number, since it uses as much as digits as its factorization.

551992321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300, while the sum is 37.

The square root of 551992321 is about 23494.5168284006. The cubic root of 551992321 is about 820.3093820672.

The spelling of 551992321 in words is "five hundred fifty-one million, nine hundred ninety-two thousand, three hundred twenty-one".