261576863 has 2 divisors, whose sum is σ = 261576864. Its totient is φ = 261576862.

The previous prime is 261576859. The next prime is 261576871. The reversal of 261576863 is 368675162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261576863 - 2² = 261576859 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261576823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130788431 + 130788432.

It is an arithmetic number, because the mean of its divisors is an integer number (130788432).

Almost surely, 2^261576863 is an apocalyptic number.

261576863 is a deficient number, since it is larger than the sum of its proper divisors (1).

261576863 is an equidigital number, since it uses as much as digits as its factorization.

261576863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The square root of 261576863 is about 16173.3380289908. The cubic root of 261576863 is about 639.5381294887.

The spelling of 261576863 in words is "two hundred sixty-one million, five hundred seventy-six thousand, eight hundred sixty-three".