256241497 has 2 divisors, whose sum is σ = 256241498. Its totient is φ = 256241496.

The previous prime is 256241483. The next prime is 256241549. The reversal of 256241497 is 794142652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218921616 + 37319881 = 14796^2 + 6109^2 .

It is a cyclic number.

It is not a de Polignac number, because 256241497 - 2¹¹ = 256239449 is a prime.

It is not a weakly prime, because it can be changed into another prime (256241197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128120748 + 128120749.

It is an arithmetic number, because the mean of its divisors is an integer number (128120749).

Almost surely, 2^256241497 is an apocalyptic number.

It is an amenable number.

256241497 is a deficient number, since it is larger than the sum of its proper divisors (1).

256241497 is an equidigital number, since it uses as much as digits as its factorization.

256241497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 256241497 is about 16007.5450022794. The cubic root of 256241497 is about 635.1600208446.

The spelling of 256241497 in words is "two hundred fifty-six million, two hundred forty-one thousand, four hundred ninety-seven".