256953517 has 2 divisors, whose sum is σ = 256953518. Its totient is φ = 256953516.

The previous prime is 256953497. The next prime is 256953547. The reversal of 256953517 is 715359652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253637476 + 3316041 = 15926^2 + 1821^2 .

It is a cyclic number.

It is not a de Polignac number, because 256953517 - 2¹⁵ = 256920749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256953547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128476758 + 128476759.

It is an arithmetic number, because the mean of its divisors is an integer number (128476759).

Almost surely, 2^256953517 is an apocalyptic number.

It is an amenable number.

256953517 is a deficient number, since it is larger than the sum of its proper divisors (1).

256953517 is an equidigital number, since it uses as much as digits as its factorization.

256953517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 283500, while the sum is 43.

The square root of 256953517 is about 16029.7697113839. The cubic root of 256953517 is about 635.7477846037.

The spelling of 256953517 in words is "two hundred fifty-six million, nine hundred fifty-three thousand, five hundred seventeen".