263680493 has 2 divisors, whose sum is σ = 263680494. Its totient is φ = 263680492.

The previous prime is 263680379. The next prime is 263680507. The reversal of 263680493 is 394086362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238949764 + 24730729 = 15458^2 + 4973^2 .

It is a cyclic number.

It is not a de Polignac number, because 263680493 - 2⁸ = 263680237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 263680493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263688493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131840246 + 131840247.

It is an arithmetic number, because the mean of its divisors is an integer number (131840247).

Almost surely, 2^263680493 is an apocalyptic number.

It is an amenable number.

263680493 is a deficient number, since it is larger than the sum of its proper divisors (1).

263680493 is an equidigital number, since it uses as much as digits as its factorization.

263680493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 263680493 is about 16238.2416843696. The cubic root of 263680493 is about 641.2479661547.

The spelling of 263680493 in words is "two hundred sixty-three million, six hundred eighty thousand, four hundred ninety-three".