263323631 has 2 divisors, whose sum is σ = 263323632. Its totient is φ = 263323630.

The previous prime is 263323609. The next prime is 263323633. The reversal of 263323631 is 136323362.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263323631 is a prime.

It is a super-2 number, since 2×263323631² = 138678669286048322, which contains 22 as substring.

Together with 263323633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 263323594 and 263323603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263323633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131661815 + 131661816.

It is an arithmetic number, because the mean of its divisors is an integer number (131661816).

Almost surely, 2^263323631 is an apocalyptic number.

263323631 is a deficient number, since it is larger than the sum of its proper divisors (1).

263323631 is an equidigital number, since it uses as much as digits as its factorization.

263323631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 29.

The square root of 263323631 is about 16227.2496437320. The cubic root of 263323631 is about 640.9585497959.

Adding to 263323631 its reverse (136323362), we get a palindrome (399646993).

The spelling of 263323631 in words is "two hundred sixty-three million, three hundred twenty-three thousand, six hundred thirty-one".