263131438693 has 2 divisors, whose sum is σ = 263131438694. Its totient is φ = 263131438692.

The previous prime is 263131438681. The next prime is 263131438733. The reversal of 263131438693 is 396834131362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181013658849 + 82117779844 = 425457^2 + 286562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263131438693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263131438643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131565719346 + 131565719347.

It is an arithmetic number, because the mean of its divisors is an integer number (131565719347).

Almost surely, 2^263131438693 is an apocalyptic number.

It is an amenable number.

263131438693 is a deficient number, since it is larger than the sum of its proper divisors (1).

263131438693 is an equidigital number, since it uses as much as digits as its factorization.

263131438693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 49.

The spelling of 263131438693 in words is "two hundred sixty-three billion, one hundred thirty-one million, four hundred thirty-eight thousand, six hundred ninety-three".