263541631 has 2 divisors, whose sum is σ = 263541632. Its totient is φ = 263541630.

The previous prime is 263541601. The next prime is 263541661. The reversal of 263541631 is 136145362.

It is a balanced prime because it is at equal distance from previous prime (263541601) and next prime (263541661).

It is a cyclic number.

It is not a de Polignac number, because 263541631 - 2⁷ = 263541503 is a prime.

It is a super-2 number, since 2×263541631² = 138908382540280322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 263541593 and 263541602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263541601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131770815 + 131770816.

It is an arithmetic number, because the mean of its divisors is an integer number (131770816).

Almost surely, 2^263541631 is an apocalyptic number.

263541631 is a deficient number, since it is larger than the sum of its proper divisors (1).

263541631 is an equidigital number, since it uses as much as digits as its factorization.

263541631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 263541631 is about 16233.9653504620. The cubic root of 263541631 is about 641.1353796302.

Adding to 263541631 its reverse (136145362), we get a palindrome (399686993).

The spelling of 263541631 in words is "two hundred sixty-three million, five hundred forty-one thousand, six hundred thirty-one".