255206621 has 2 divisors, whose sum is σ = 255206622. Its totient is φ = 255206620.

The previous prime is 255206603. The next prime is 255206639. The reversal of 255206621 is 126602552.

It is a balanced prime because it is at equal distance from previous prime (255206603) and next prime (255206639).

It can be written as a sum of positive squares in only one way, i.e., 205348900 + 49857721 = 14330^2 + 7061^2 .

It is a cyclic number.

It is not a de Polignac number, because 255206621 - 2⁶ = 255206557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255206681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127603310 + 127603311.

It is an arithmetic number, because the mean of its divisors is an integer number (127603311).

Almost surely, 2^255206621 is an apocalyptic number.

It is an amenable number.

255206621 is a deficient number, since it is larger than the sum of its proper divisors (1).

255206621 is an equidigital number, since it uses as much as digits as its factorization.

255206621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 255206621 is about 15975.1876671293. The cubic root of 255206621 is about 634.3037989474.

The spelling of 255206621 in words is "two hundred fifty-five million, two hundred six thousand, six hundred twenty-one".