255522521 has 2 divisors, whose sum is σ = 255522522. Its totient is φ = 255522520.

The previous prime is 255522517. The next prime is 255522559. The reversal of 255522521 is 125225552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222010000 + 33512521 = 14900^2 + 5789^2 .

It is a cyclic number.

It is not a de Polignac number, because 255522521 - 2² = 255522517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255522511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127761260 + 127761261.

It is an arithmetic number, because the mean of its divisors is an integer number (127761261).

Almost surely, 2^255522521 is an apocalyptic number.

It is an amenable number.

255522521 is a deficient number, since it is larger than the sum of its proper divisors (1).

255522521 is an equidigital number, since it uses as much as digits as its factorization.

255522521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10000, while the sum is 29.

The square root of 255522521 is about 15985.0718171674. The cubic root of 255522521 is about 634.5654091274.

The spelling of 255522521 in words is "two hundred fifty-five million, five hundred twenty-two thousand, five hundred twenty-one".