256598653 has 2 divisors, whose sum is σ = 256598654. Its totient is φ = 256598652.

The previous prime is 256598621. The next prime is 256598669. The reversal of 256598653 is 356895652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225540324 + 31058329 = 15018^2 + 5573^2 .

It is a cyclic number.

It is not a de Polignac number, because 256598653 - 2⁵ = 256598621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256598597 and 256598606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256598453) 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, 128299326 + 128299327.

It is an arithmetic number, because the mean of its divisors is an integer number (128299327).

Almost surely, 2^256598653 is an apocalyptic number.

It is an amenable number.

256598653 is a deficient number, since it is larger than the sum of its proper divisors (1).

256598653 is an equidigital number, since it uses as much as digits as its factorization.

256598653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944000, while the sum is 49.

The square root of 256598653 is about 16018.6969819645. The cubic root of 256598653 is about 635.4549846445.

The spelling of 256598653 in words is "two hundred fifty-six million, five hundred ninety-eight thousand, six hundred fifty-three".