263036261 has 2 divisors, whose sum is σ = 263036262. Its totient is φ = 263036260.

The previous prime is 263036239. The next prime is 263036287. The reversal of 263036261 is 162630362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236975236 + 26061025 = 15394^2 + 5105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263036261 is a prime.

It is a Sophie Germain 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 (263036201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131518130 + 131518131.

It is an arithmetic number, because the mean of its divisors is an integer number (131518131).

Almost surely, 2^263036261 is an apocalyptic number.

It is an amenable number.

263036261 is a deficient number, since it is larger than the sum of its proper divisors (1).

263036261 is an equidigital number, since it uses as much as digits as its factorization.

263036261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 263036261 is about 16218.3926762179. The cubic root of 263036261 is about 640.7253015777.

The spelling of 263036261 in words is "two hundred sixty-three million, thirty-six thousand, two hundred sixty-one".