256497273 has 20 divisors (see below), whose sum is σ = 383607268. Its totient is φ = 170799840.

The previous prime is 256497251. The next prime is 256497287. The reversal of 256497273 is 372794652.

It can be written as a sum of positive squares in 2 ways, for example, as 95004009 + 161493264 = 9747^2 + 12708^2 .

It is a de Polignac number, because none of the positive numbers 2^k-256497273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256497223) 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 in 19 ways as a sum of consecutive naturals, for example, 110715 + ... + 113007.

Almost surely, 2^256497273 is an apocalyptic number.

It is an amenable number.

256497273 is a deficient number, since it is larger than the sum of its proper divisors (127109995).

256497273 is a wasteful number, since it uses less digits than its factorization.

256497273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3686 (or 3677 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 256497273 is about 16015.5322421704. The cubic root of 256497273 is about 635.3712859556.

The spelling of 256497273 in words is "two hundred fifty-six million, four hundred ninety-seven thousand, two hundred seventy-three".