263731493 has 2 divisors, whose sum is σ = 263731494. Its totient is φ = 263731492.

The previous prime is 263731483. The next prime is 263731499. The reversal of 263731493 is 394137362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257345764 + 6385729 = 16042^2 + 2527^2 .

It is a cyclic number.

It is not a de Polignac number, because 263731493 - 2¹² = 263727397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263731499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131865746 + 131865747.

It is an arithmetic number, because the mean of its divisors is an integer number (131865747).

Almost surely, 2^263731493 is an apocalyptic number.

It is an amenable number.

263731493 is a deficient number, since it is larger than the sum of its proper divisors (1).

263731493 is an equidigital number, since it uses as much as digits as its factorization.

263731493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 38.

The square root of 263731493 is about 16239.8119755125. The cubic root of 263731493 is about 641.2893060072.

The spelling of 263731493 in words is "two hundred sixty-three million, seven hundred thirty-one thousand, four hundred ninety-three".