263938513 has 2 divisors, whose sum is σ = 263938514. Its totient is φ = 263938512.

The previous prime is 263938459. The next prime is 263938529. The reversal of 263938513 is 315839362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241118784 + 22819729 = 15528^2 + 4777^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263938513 is a prime.

It is not a weakly prime, because it can be changed into another prime (263938013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131969256 + 131969257.

It is an arithmetic number, because the mean of its divisors is an integer number (131969257).

Almost surely, 2^263938513 is an apocalyptic number.

It is an amenable number.

263938513 is a deficient number, since it is larger than the sum of its proper divisors (1).

263938513 is an equidigital number, since it uses as much as digits as its factorization.

263938513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The square root of 263938513 is about 16246.1845674608. The cubic root of 263938513 is about 641.4570586818.

The spelling of 263938513 in words is "two hundred sixty-three million, nine hundred thirty-eight thousand, five hundred thirteen".