263562491 has 2 divisors, whose sum is σ = 263562492. Its totient is φ = 263562490.

The previous prime is 263562461. The next prime is 263562493. The reversal of 263562491 is 194265362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 263562491 - 2⁶ = 263562427 is a prime.

Together with 263562493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (263562493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131781245 + 131781246.

It is an arithmetic number, because the mean of its divisors is an integer number (131781246).

Almost surely, 2^263562491 is an apocalyptic number.

263562491 is a deficient number, since it is larger than the sum of its proper divisors (1).

263562491 is an equidigital number, since it uses as much as digits as its factorization.

263562491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 263562491 is about 16234.6078178686. The cubic root of 263562491 is about 641.1522950237.

The spelling of 263562491 in words is "two hundred sixty-three million, five hundred sixty-two thousand, four hundred ninety-one".