263669261 has 2 divisors, whose sum is σ = 263669262. Its totient is φ = 263669260.

The previous prime is 263669209. The next prime is 263669279. The reversal of 263669261 is 162966362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259693225 + 3976036 = 16115^2 + 1994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263669261 is a prime.

It is a super-2 number, since 2×263669261² = 139042958392572242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263669281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131834630 + 131834631.

It is an arithmetic number, because the mean of its divisors is an integer number (131834631).

Almost surely, 2^263669261 is an apocalyptic number.

It is an amenable number.

263669261 is a deficient number, since it is larger than the sum of its proper divisors (1).

263669261 is an equidigital number, since it uses as much as digits as its factorization.

263669261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 41.

The square root of 263669261 is about 16237.8958304332. The cubic root of 263669261 is about 641.2388609439.

The spelling of 263669261 in words is "two hundred sixty-three million, six hundred sixty-nine thousand, two hundred sixty-one".