256802551 has 2 divisors, whose sum is σ = 256802552. Its totient is φ = 256802550.

The previous prime is 256802531. The next prime is 256802573. The reversal of 256802551 is 155208652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256802551 - 2¹¹ = 256800503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256802531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128401275 + 128401276.

It is an arithmetic number, because the mean of its divisors is an integer number (128401276).

Almost surely, 2^256802551 is an apocalyptic number.

256802551 is a deficient number, since it is larger than the sum of its proper divisors (1).

256802551 is an equidigital number, since it uses as much as digits as its factorization.

256802551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 256802551 is about 16025.0600934911. The cubic root of 256802551 is about 635.6232548141.

The spelling of 256802551 in words is "two hundred fifty-six million, eight hundred two thousand, five hundred fifty-one".