263131438949 has 2 divisors, whose sum is σ = 263131438950. Its totient is φ = 263131438948.

The previous prime is 263131438931. The next prime is 263131438951. The reversal of 263131438949 is 949834131362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228393189025 + 34738249924 = 477905^2 + 186382^2 .

It is a cyclic number.

It is not a de Polignac number, because 263131438949 - 2⁸ = 263131438693 is a prime.

Together with 263131438951, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 263131438949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263131435949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131565719474 + 131565719475.

It is an arithmetic number, because the mean of its divisors is an integer number (131565719475).

Almost surely, 2^263131438949 is an apocalyptic number.

It is an amenable number.

263131438949 is a deficient number, since it is larger than the sum of its proper divisors (1).

263131438949 is an equidigital number, since it uses as much as digits as its factorization.

263131438949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 53.

The spelling of 263131438949 in words is "two hundred sixty-three billion, one hundred thirty-one million, four hundred thirty-eight thousand, nine hundred forty-nine".