263224721 has 2 divisors, whose sum is σ = 263224722. Its totient is φ = 263224720.

The previous prime is 263224693. The next prime is 263224723. The reversal of 263224721 is 127422362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226924096 + 36300625 = 15064^2 + 6025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263224721 is a prime.

Together with 263224723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (263224723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131612360 + 131612361.

It is an arithmetic number, because the mean of its divisors is an integer number (131612361).

Almost surely, 2^263224721 is an apocalyptic number.

It is an amenable number.

263224721 is a deficient number, since it is larger than the sum of its proper divisors (1).

263224721 is an equidigital number, since it uses as much as digits as its factorization.

263224721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 29.

The square root of 263224721 is about 16224.2017060933. The cubic root of 263224721 is about 640.8782871557.

The spelling of 263224721 in words is "two hundred sixty-three million, two hundred twenty-four thousand, seven hundred twenty-one".