256215163 has 2 divisors, whose sum is σ = 256215164. Its totient is φ = 256215162.

The previous prime is 256215161. The next prime is 256215233. The reversal of 256215163 is 361512652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256215163 - 2¹ = 256215161 is a prime.

It is a super-2 number, since 2×256215163² = 131292419502233138, which contains 22 as substring.

Together with 256215161, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (256215161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128107581 + 128107582.

It is an arithmetic number, because the mean of its divisors is an integer number (128107582).

Almost surely, 2^256215163 is an apocalyptic number.

256215163 is a deficient number, since it is larger than the sum of its proper divisors (1).

256215163 is an equidigital number, since it uses as much as digits as its factorization.

256215163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 256215163 is about 16006.7224315286. The cubic root of 256215163 is about 635.1382615834.

The spelling of 256215163 in words is "two hundred fifty-six million, two hundred fifteen thousand, one hundred sixty-three".