256506007 has 2 divisors, whose sum is σ = 256506008. Its totient is φ = 256506006.

The previous prime is 256506001. The next prime is 256506043. The reversal of 256506007 is 700605652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256506007 - 2³ = 256505999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256506007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256506001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128253003 + 128253004.

It is an arithmetic number, because the mean of its divisors is an integer number (128253004).

Almost surely, 2^256506007 is an apocalyptic number.

256506007 is a deficient number, since it is larger than the sum of its proper divisors (1).

256506007 is an equidigital number, since it uses as much as digits as its factorization.

256506007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 256506007 is about 16015.8049126480. The cubic root of 256506007 is about 635.3784975590.

The spelling of 256506007 in words is "two hundred fifty-six million, five hundred six thousand, seven".