263563217 has 2 divisors, whose sum is σ = 263563218. Its totient is φ = 263563216.

The previous prime is 263563171. The next prime is 263563229. The reversal of 263563217 is 712365362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137921536 + 125641681 = 11744^2 + 11209^2 .

It is a cyclic number.

It is not a de Polignac number, because 263563217 - 2²² = 259368913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (263560217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131781608 + 131781609.

It is an arithmetic number, because the mean of its divisors is an integer number (131781609).

Almost surely, 2^263563217 is an apocalyptic number.

It is an amenable number.

263563217 is a deficient number, since it is larger than the sum of its proper divisors (1).

263563217 is an equidigital number, since it uses as much as digits as its factorization.

263563217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 35.

The square root of 263563217 is about 16234.6301774940. The cubic root of 263563217 is about 641.1528837217.

The spelling of 263563217 in words is "two hundred sixty-three million, five hundred sixty-three thousand, two hundred seventeen".