861886271 has 2 divisors, whose sum is σ = 861886272. Its totient is φ = 861886270.

The previous prime is 861886261. The next prime is 861886279. The reversal of 861886271 is 172688168.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861886271 - 2²⁶ = 794777407 is a prime.

It is a super-3 number, since 3×861886271³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861886279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430943135 + 430943136.

It is an arithmetic number, because the mean of its divisors is an integer number (430943136).

Almost surely, 2^861886271 is an apocalyptic number.

861886271 is a deficient number, since it is larger than the sum of its proper divisors (1).

861886271 is an equidigital number, since it uses as much as digits as its factorization.

861886271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 47.

The square root of 861886271 is about 29357.8996353622. The cubic root of 861886271 is about 951.6632988711.

The spelling of 861886271 in words is "eight hundred sixty-one million, eight hundred eighty-six thousand, two hundred seventy-one".