256480247 has 2 divisors, whose sum is σ = 256480248. Its totient is φ = 256480246.

The previous prime is 256480223. The next prime is 256480261. The reversal of 256480247 is 742084652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256480247 - 2²⁶ = 189371383 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256480247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256480277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128240123 + 128240124.

It is an arithmetic number, because the mean of its divisors is an integer number (128240124).

Almost surely, 2^256480247 is an apocalyptic number.

256480247 is a deficient number, since it is larger than the sum of its proper divisors (1).

256480247 is an equidigital number, since it uses as much as digits as its factorization.

256480247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 256480247 is about 16015.0006868561. Note that the first 3 decimals coincide. The cubic root of 256480247 is about 635.3572272345.

The spelling of 256480247 in words is "two hundred fifty-six million, four hundred eighty thousand, two hundred forty-seven".