263131435949 has 2 divisors, whose sum is σ = 263131435950. Its totient is φ = 263131435948.

The previous prime is 263131435921. The next prime is 263131435969. The reversal of 263131435949 is 949534131362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262625500900 + 505935049 = 512470^2 + 22493^2 .

It is a cyclic number.

It is not a de Polignac number, because 263131435949 - 2²⁸ = 262863000493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 263131435897 and 263131435906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263131435969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131565717974 + 131565717975.

It is an arithmetic number, because the mean of its divisors is an integer number (131565717975).

Almost surely, 2^263131435949 is an apocalyptic number.

It is an amenable number.

263131435949 is a deficient number, since it is larger than the sum of its proper divisors (1).

263131435949 is an equidigital number, since it uses as much as digits as its factorization.

263131435949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 50.

The spelling of 263131435949 in words is "two hundred sixty-three billion, one hundred thirty-one million, four hundred thirty-five thousand, nine hundred forty-nine".