263541601 has 2 divisors, whose sum is σ = 263541602. Its totient is φ = 263541600.

The previous prime is 263541583. The next prime is 263541631. The reversal of 263541601 is 106145362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142563600 + 120978001 = 11940^2 + 10999^2 .

It is a cyclic number.

It is not a de Polignac number, because 263541601 - 2¹¹ = 263539553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 263541601.

It is not a weakly prime, because it can be changed into another prime (263541631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131770800 + 131770801.

It is an arithmetic number, because the mean of its divisors is an integer number (131770801).

Almost surely, 2^263541601 is an apocalyptic number.

It is an amenable number.

263541601 is a deficient number, since it is larger than the sum of its proper divisors (1).

263541601 is an equidigital number, since it uses as much as digits as its factorization.

263541601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 263541601 is about 16233.9644264733. The cubic root of 263541601 is about 641.1353553025.

Adding to 263541601 its reverse (106145362), we get a palindrome (369686963).

The spelling of 263541601 in words is "two hundred sixty-three million, five hundred forty-one thousand, six hundred one".