263839493 has 2 divisors, whose sum is σ = 263839494. Its totient is φ = 263839492.

The previous prime is 263839421. The next prime is 263839559. The reversal of 263839493 is 394938362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170485249 + 93354244 = 13057^2 + 9662^2 .

It is a cyclic number.

It is not a de Polignac number, because 263839493 - 2²⁰ = 262790917 is a prime.

It is a super-2 number, since 2×263839493² = 139222556132994098, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263839393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131919746 + 131919747.

It is an arithmetic number, because the mean of its divisors is an integer number (131919747).

Almost surely, 2^263839493 is an apocalyptic number.

It is an amenable number.

263839493 is a deficient number, since it is larger than the sum of its proper divisors (1).

263839493 is an equidigital number, since it uses as much as digits as its factorization.

263839493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 47.

The square root of 263839493 is about 16243.1367968136. The cubic root of 263839493 is about 641.3768316345.

The spelling of 263839493 in words is "two hundred sixty-three million, eight hundred thirty-nine thousand, four hundred ninety-three".