256617367 has 2 divisors, whose sum is σ = 256617368. Its totient is φ = 256617366.

The previous prime is 256617337. The next prime is 256617391. The reversal of 256617367 is 763716652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256617367 - 2¹¹ = 256615319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256617307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128308683 + 128308684.

It is an arithmetic number, because the mean of its divisors is an integer number (128308684).

Almost surely, 2^256617367 is an apocalyptic number.

256617367 is a deficient number, since it is larger than the sum of its proper divisors (1).

256617367 is an equidigital number, since it uses as much as digits as its factorization.

256617367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 43.

The square root of 256617367 is about 16019.2811012230. The cubic root of 256617367 is about 635.4704323944.

The spelling of 256617367 in words is "two hundred fifty-six million, six hundred seventeen thousand, three hundred sixty-seven".