256203697 has 6 divisors (see below), whose sum is σ = 257000918. Its totient is φ = 255408384.

The previous prime is 256203691. The next prime is 256203707. The reversal of 256203697 is 796302652.

It can be written as a sum of positive squares in 3 ways, for example, as 23824161 + 232379536 = 4881^2 + 15244^2 .

It is a de Polignac number, because none of the positive numbers 2^k-256203697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256203691) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 380353 + ... + 381025.

Almost surely, 2^256203697 is an apocalyptic number.

It is an amenable number.

256203697 is a deficient number, since it is larger than the sum of its proper divisors (797221).

256203697 is an frugal number, since it uses more digits than its factorization.

256203697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 256203697 is about 16006.3642655039. The cubic root of 256203697 is about 635.1287869894.

The spelling of 256203697 in words is "two hundred fifty-six million, two hundred three thousand, six hundred ninety-seven".