263131438931 has 2 divisors, whose sum is σ = 263131438932. Its totient is φ = 263131438930.

The previous prime is 263131438901. The next prime is 263131438949. The reversal of 263131438931 is 139834131362.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263131438931 is a prime.

It is a super-2 number, since 2×263131438931² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (263131438901) 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, 131565719465 + 131565719466.

It is an arithmetic number, because the mean of its divisors is an integer number (131565719466).

Almost surely, 2^263131438931 is an apocalyptic number.

263131438931 is a deficient number, since it is larger than the sum of its proper divisors (1).

263131438931 is an equidigital number, since it uses as much as digits as its factorization.

263131438931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 44.

The spelling of 263131438931 in words is "two hundred sixty-three billion, one hundred thirty-one million, four hundred thirty-eight thousand, nine hundred thirty-one".