256745243 has 2 divisors, whose sum is σ = 256745244. Its totient is φ = 256745242.

The previous prime is 256745231. The next prime is 256745267. The reversal of 256745243 is 342547652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256745243 - 2⁶ = 256745179 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 256745197 and 256745206.

It is not a weakly prime, because it can be changed into another prime (256745213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128372621 + 128372622.

It is an arithmetic number, because the mean of its divisors is an integer number (128372622).

Almost surely, 2^256745243 is an apocalyptic number.

256745243 is a deficient number, since it is larger than the sum of its proper divisors (1).

256745243 is an equidigital number, since it uses as much as digits as its factorization.

256745243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 38.

The square root of 256745243 is about 16023.2719193054. The cubic root of 256745243 is about 635.5759694486.

The spelling of 256745243 in words is "two hundred fifty-six million, seven hundred forty-five thousand, two hundred forty-three".