256214591 has 2 divisors, whose sum is σ = 256214592. Its totient is φ = 256214590.

The previous prime is 256214537. The next prime is 256214593. The reversal of 256214591 is 195412652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256214591 - 2⁶ = 256214527 is a prime.

Together with 256214593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256214593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128107295 + 128107296.

It is an arithmetic number, because the mean of its divisors is an integer number (128107296).

Almost surely, 2^256214591 is an apocalyptic number.

256214591 is a deficient number, since it is larger than the sum of its proper divisors (1).

256214591 is an equidigital number, since it uses as much as digits as its factorization.

256214591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The square root of 256214591 is about 16006.7045640257. The cubic root of 256214591 is about 635.1377889346.

The spelling of 256214591 in words is "two hundred fifty-six million, two hundred fourteen thousand, five hundred ninety-one".