263401001 has 2 divisors, whose sum is σ = 263401002. Its totient is φ = 263401000.

The previous prime is 263400979. The next prime is 263401027. The reversal of 263401001 is 100104362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143520400 + 119880601 = 11980^2 + 10949^2 .

It is a cyclic number.

It is not a de Polignac number, because 263401001 - 2¹⁰ = 263399977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (263401091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131700500 + 131700501.

It is an arithmetic number, because the mean of its divisors is an integer number (131700501).

Almost surely, 2^263401001 is an apocalyptic number.

It is an amenable number.

263401001 is a deficient number, since it is larger than the sum of its proper divisors (1).

263401001 is an equidigital number, since it uses as much as digits as its factorization.

263401001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 263401001 is about 16229.6334216149. The cubic root of 263401001 is about 641.0213193325.

Adding to 263401001 its reverse (100104362), we get a palindrome (363505363).

The spelling of 263401001 in words is "two hundred sixty-three million, four hundred one thousand, one".