255325621 has 2 divisors, whose sum is σ = 255325622. Its totient is φ = 255325620.

The previous prime is 255325613. The next prime is 255325643. The reversal of 255325621 is 126523552.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246144721 + 9180900 = 15689^2 + 3030^2 .

It is a cyclic number.

It is not a de Polignac number, because 255325621 - 2³ = 255325613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255325661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127662810 + 127662811.

It is an arithmetic number, because the mean of its divisors is an integer number (127662811).

Almost surely, 2^255325621 is an apocalyptic number.

It is an amenable number.

255325621 is a deficient number, since it is larger than the sum of its proper divisors (1).

255325621 is an equidigital number, since it uses as much as digits as its factorization.

255325621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 31.

The square root of 255325621 is about 15978.9117589403. The cubic root of 255325621 is about 634.4023732225.

The spelling of 255325621 in words is "two hundred fifty-five million, three hundred twenty-five thousand, six hundred twenty-one".