263995231 has 2 divisors, whose sum is σ = 263995232. Its totient is φ = 263995230.

The previous prime is 263995183. The next prime is 263995321. The reversal of 263995231 is 132599362.

Together with next prime (263995321) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263995231 is a prime.

It is a super-2 number, since 2×263995231² = 139386963981486722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263995031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131997615 + 131997616.

It is an arithmetic number, because the mean of its divisors is an integer number (131997616).

Almost surely, 2^263995231 is an apocalyptic number.

263995231 is a deficient number, since it is larger than the sum of its proper divisors (1).

263995231 is an equidigital number, since it uses as much as digits as its factorization.

263995231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 40.

The square root of 263995231 is about 16247.9300527790. The cubic root of 263995231 is about 641.5030031650.

The spelling of 263995231 in words is "two hundred sixty-three million, nine hundred ninety-five thousand, two hundred thirty-one".