861361471 has 2 divisors, whose sum is σ = 861361472. Its totient is φ = 861361470.

The previous prime is 861361453. The next prime is 861361481. The reversal of 861361471 is 174163168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861361471 - 2⁷ = 861361343 is a prime.

It is a super-3 number, since 3×861361471³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 861361471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861361481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430680735 + 430680736.

It is an arithmetic number, because the mean of its divisors is an integer number (430680736).

Almost surely, 2^861361471 is an apocalyptic number.

861361471 is a deficient number, since it is larger than the sum of its proper divisors (1).

861361471 is an equidigital number, since it uses as much as digits as its factorization.

861361471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 861361471 is about 29348.9603052646. The cubic root of 861361471 is about 951.4701046651.

The spelling of 861361471 in words is "eight hundred sixty-one million, three hundred sixty-one thousand, four hundred seventy-one".