263623901 has 2 divisors, whose sum is σ = 263623902. Its totient is φ = 263623900.

The previous prime is 263623897. The next prime is 263623939. The reversal of 263623901 is 109326362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199543876 + 64080025 = 14126^2 + 8005^2 .

It is a cyclic number.

It is not a de Polignac number, because 263623901 - 2² = 263623897 is a prime.

It is a super-2 number, since 2×263623901² = 138995122356915602, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263623991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131811950 + 131811951.

It is an arithmetic number, because the mean of its divisors is an integer number (131811951).

Almost surely, 2^263623901 is an apocalyptic number.

It is an amenable number.

263623901 is a deficient number, since it is larger than the sum of its proper divisors (1).

263623901 is an equidigital number, since it uses as much as digits as its factorization.

263623901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 263623901 is about 16236.4990376620. The cubic root of 263623901 is about 641.2020872693.

The spelling of 263623901 in words is "two hundred sixty-three million, six hundred twenty-three thousand, nine hundred one".