861946471 has 2 divisors, whose sum is σ = 861946472. Its totient is φ = 861946470.

The previous prime is 861946447. The next prime is 861946493. The reversal of 861946471 is 174649168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861946471 - 2¹⁷ = 861815399 is a prime.

It is a super-3 number, since 3×861946471³ (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 (861946441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430973235 + 430973236.

It is an arithmetic number, because the mean of its divisors is an integer number (430973236).

Almost surely, 2^861946471 is an apocalyptic number.

861946471 is a deficient number, since it is larger than the sum of its proper divisors (1).

861946471 is an equidigital number, since it uses as much as digits as its factorization.

861946471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 861946471 is about 29358.9248951660. The cubic root of 861946471 is about 951.6854552347.

It can be divided in two parts, 86194 and 6471, that added together give a triangular number (92665 = T₄₃₀).

The spelling of 861946471 in words is "eight hundred sixty-one million, nine hundred forty-six thousand, four hundred seventy-one".