261042263 has 2 divisors, whose sum is σ = 261042264. Its totient is φ = 261042262.

The previous prime is 261042193. The next prime is 261042281. The reversal of 261042263 is 362240162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261042263 - 2²⁰ = 259993687 is a prime.

It is a super-2 number, since 2×261042263² = 136286126144322338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261042163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130521131 + 130521132.

It is an arithmetic number, because the mean of its divisors is an integer number (130521132).

Almost surely, 2^261042263 is an apocalyptic number.

261042263 is a deficient number, since it is larger than the sum of its proper divisors (1).

261042263 is an equidigital number, since it uses as much as digits as its factorization.

261042263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 261042263 is about 16156.8023754702. The cubic root of 261042263 is about 639.1021451241.

The spelling of 261042263 in words is "two hundred sixty-one million, forty-two thousand, two hundred sixty-three".