256254491 has 2 divisors, whose sum is σ = 256254492. Its totient is φ = 256254490.

The previous prime is 256254437. The next prime is 256254529. The reversal of 256254491 is 194452652.

It is a happy number.

It is an a-pointer prime, because the next prime (256254529) can be obtained adding 256254491 to its sum of digits (38).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256254491 - 2¹⁰ = 256253467 is a prime.

It is not a weakly prime, because it can be changed into another prime (256254391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128127245 + 128127246.

It is an arithmetic number, because the mean of its divisors is an integer number (128127246).

Almost surely, 2^256254491 is an apocalyptic number.

256254491 is a deficient number, since it is larger than the sum of its proper divisors (1).

256254491 is an equidigital number, since it uses as much as digits as its factorization.

256254491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 38.

The square root of 256254491 is about 16007.9508682404. The cubic root of 256254491 is about 635.1707569795.

The spelling of 256254491 in words is "two hundred fifty-six million, two hundred fifty-four thousand, four hundred ninety-one".