256724471 has 2 divisors, whose sum is σ = 256724472. Its totient is φ = 256724470.

The previous prime is 256724453. The next prime is 256724473. The reversal of 256724471 is 174427652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256724471 - 2⁶ = 256724407 is a prime.

It is a super-3 number, since 3×256724471³ (a number of 26 digits) contains 333 as substring.

Together with 256724473, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256724473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128362235 + 128362236.

It is an arithmetic number, because the mean of its divisors is an integer number (128362236).

Almost surely, 2^256724471 is an apocalyptic number.

256724471 is a deficient number, since it is larger than the sum of its proper divisors (1).

256724471 is an equidigital number, since it uses as much as digits as its factorization.

256724471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 38.

The square root of 256724471 is about 16022.6237239723. The cubic root of 256724471 is about 635.5588285401.

The spelling of 256724471 in words is "two hundred fifty-six million, seven hundred twenty-four thousand, four hundred seventy-one".