256339133 has 2 divisors, whose sum is σ = 256339134. Its totient is φ = 256339132.

The previous prime is 256339123. The next prime is 256339157. The reversal of 256339133 is 331933652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216737284 + 39601849 = 14722^2 + 6293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256339133 is a prime.

It is a super-2 number, since 2×256339133² = 131419502214383378, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 256339093 and 256339102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256339123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128169566 + 128169567.

It is an arithmetic number, because the mean of its divisors is an integer number (128169567).

Almost surely, 2^256339133 is an apocalyptic number.

It is an amenable number.

256339133 is a deficient number, since it is larger than the sum of its proper divisors (1).

256339133 is an equidigital number, since it uses as much as digits as its factorization.

256339133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 35.

The square root of 256339133 is about 16010.5943987099. The cubic root of 256339133 is about 635.2406825247.

The spelling of 256339133 in words is "two hundred fifty-six million, three hundred thirty-nine thousand, one hundred thirty-three".