4256491 has 2 divisors, whose sum is σ = 4256492. Its totient is φ = 4256490.

The previous prime is 4256471. The next prime is 4256501. The reversal of 4256491 is 1946524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4256491 - 2⁵ = 4256459 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 4 + 2 + 5⁵ + 6 + 4¹¹ + 9⁵ + 1 .

It is not a weakly prime, because it can be changed into another prime (4256431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2128245 + 2128246.

It is an arithmetic number, because the mean of its divisors is an integer number (2128246).

Almost surely, 2^4256491 is an apocalyptic number.

4256491 is a deficient number, since it is larger than the sum of its proper divisors (1).

4256491 is an equidigital number, since it uses as much as digits as its factorization.

4256491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 4256491 is about 2063.1265109052. The cubic root of 4256491 is about 162.0630121180.

The spelling of 4256491 in words is "four million, two hundred fifty-six thousand, four hundred ninety-one".