256522291 has 2 divisors, whose sum is σ = 256522292. Its totient is φ = 256522290.

The previous prime is 256522261. The next prime is 256522307. The reversal of 256522291 is 192225652.

256522291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256522291 - 2¹³ = 256514099 is a prime.

It is not a weakly prime, because it can be changed into another prime (256522261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128261145 + 128261146.

It is an arithmetic number, because the mean of its divisors is an integer number (128261146).

Almost surely, 2^256522291 is an apocalyptic number.

256522291 is a deficient number, since it is larger than the sum of its proper divisors (1).

256522291 is an equidigital number, since it uses as much as digits as its factorization.

256522291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 256522291 is about 16016.3132774056. The cubic root of 256522291 is about 635.3919427081.

The spelling of 256522291 in words is "two hundred fifty-six million, five hundred twenty-two thousand, two hundred ninety-one".