263420257 has 4 divisors (see below), whose sum is σ = 263883780. Its totient is φ = 262956736.

The previous prime is 263420251. The next prime is 263420263. The reversal of 263420257 is 752024362.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (263420251) and next prime (263420263).

It can be written as a sum of positive squares in 2 ways, for example, as 160174336 + 103245921 = 12656^2 + 10161^2 .

It is a cyclic number.

It is not a de Polignac number, because 263420257 - 2¹¹ = 263418209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263420251) 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 3 ways as a sum of consecutive naturals, for example, 230908 + ... + 232045.

It is an arithmetic number, because the mean of its divisors is an integer number (65970945).

Almost surely, 2^263420257 is an apocalyptic number.

It is an amenable number.

263420257 is a deficient number, since it is larger than the sum of its proper divisors (463523).

263420257 is an equidigital number, since it uses as much as digits as its factorization.

263420257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463522.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 263420257 is about 16230.2266465999. The cubic root of 263420257 is about 641.0369396297.

The spelling of 263420257 in words is "two hundred sixty-three million, four hundred twenty thousand, two hundred fifty-seven".