255806501 has 2 divisors, whose sum is σ = 255806502. Its totient is φ = 255806500.

The previous prime is 255806479. The next prime is 255806543. The reversal of 255806501 is 105608552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191822500 + 63984001 = 13850^2 + 7999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255806501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255806591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127903250 + 127903251.

It is an arithmetic number, because the mean of its divisors is an integer number (127903251).

Almost surely, 2^255806501 is an apocalyptic number.

It is an amenable number.

255806501 is a deficient number, since it is larger than the sum of its proper divisors (1).

255806501 is an equidigital number, since it uses as much as digits as its factorization.

255806501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 255806501 is about 15993.9520131830. The cubic root of 255806501 is about 634.8004010277.

The spelling of 255806501 in words is "two hundred fifty-five million, eight hundred six thousand, five hundred one".