255521551 has 2 divisors, whose sum is σ = 255521552. Its totient is φ = 255521550.

The previous prime is 255521537. The next prime is 255521573. The reversal of 255521551 is 155125552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255521551 - 2⁷ = 255521423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255521531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127760775 + 127760776.

It is an arithmetic number, because the mean of its divisors is an integer number (127760776).

Almost surely, 2^255521551 is an apocalyptic number.

255521551 is a deficient number, since it is larger than the sum of its proper divisors (1).

255521551 is an equidigital number, since it uses as much as digits as its factorization.

255521551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12500, while the sum is 31.

The square root of 255521551 is about 15985.0414763303. The cubic root of 255521551 is about 634.5646061594.

The spelling of 255521551 in words is "two hundred fifty-five million, five hundred twenty-one thousand, five hundred fifty-one".