261795871 has 2 divisors, whose sum is σ = 261795872. Its totient is φ = 261795870.

The previous prime is 261795829. The next prime is 261795881. The reversal of 261795871 is 178597162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261795871 - 2¹¹ = 261793823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261795881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130897935 + 130897936.

It is an arithmetic number, because the mean of its divisors is an integer number (130897936).

Almost surely, 2^261795871 is an apocalyptic number.

261795871 is a deficient number, since it is larger than the sum of its proper divisors (1).

261795871 is an equidigital number, since it uses as much as digits as its factorization.

261795871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 46.

The square root of 261795871 is about 16180.1072616964. The cubic root of 261795871 is about 639.7165663902.

The spelling of 261795871 in words is "two hundred sixty-one million, seven hundred ninety-five thousand, eight hundred seventy-one".