255553321 has 2 divisors, whose sum is σ = 255553322. Its totient is φ = 255553320.

The previous prime is 255553301. The next prime is 255553349. The reversal of 255553321 is 123355552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249482025 + 6071296 = 15795^2 + 2464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255553321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255553301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127776660 + 127776661.

It is an arithmetic number, because the mean of its divisors is an integer number (127776661).

Almost surely, 2^255553321 is an apocalyptic number.

It is an amenable number.

255553321 is a deficient number, since it is larger than the sum of its proper divisors (1).

255553321 is an equidigital number, since it uses as much as digits as its factorization.

255553321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22500, while the sum is 31.

The square root of 255553321 is about 15986.0351869999. The cubic root of 255553321 is about 634.5909043744.

The spelling of 255553321 in words is "two hundred fifty-five million, five hundred fifty-three thousand, three hundred twenty-one".