263484391 has 2 divisors, whose sum is σ = 263484392. Its totient is φ = 263484390.

The previous prime is 263484341. The next prime is 263484433. The reversal of 263484391 is 193484362.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263484391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263484311) 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, 131742195 + 131742196.

It is an arithmetic number, because the mean of its divisors is an integer number (131742196).

Almost surely, 2^263484391 is an apocalyptic number.

263484391 is a deficient number, since it is larger than the sum of its proper divisors (1).

263484391 is an equidigital number, since it uses as much as digits as its factorization.

263484391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 40.

The square root of 263484391 is about 16232.2022843482. The cubic root of 263484391 is about 641.0889590751.

It can be divided in two parts, 2634 and 84391, that added together give a square (87025 = 295²).

The spelling of 263484391 in words is "two hundred sixty-three million, four hundred eighty-four thousand, three hundred ninety-one".