263441861 has 2 divisors, whose sum is σ = 263441862. Its totient is φ = 263441860.

The previous prime is 263441837. The next prime is 263441873. The reversal of 263441861 is 168144362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217120225 + 46321636 = 14735^2 + 6806^2 .

It is a cyclic number.

It is not a de Polignac number, because 263441861 - 2⁶ = 263441797 is a prime.

It is a super-2 number, since 2×263441861² = 138803228254286642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263441831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131720930 + 131720931.

It is an arithmetic number, because the mean of its divisors is an integer number (131720931).

Almost surely, 2^263441861 is an apocalyptic number.

It is an amenable number.

263441861 is a deficient number, since it is larger than the sum of its proper divisors (1).

263441861 is an equidigital number, since it uses as much as digits as its factorization.

263441861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 263441861 is about 16230.8921812696. The cubic root of 263441861 is about 641.0544636976.

The spelling of 263441861 in words is "two hundred sixty-three million, four hundred forty-one thousand, eight hundred sixty-one".