861481669 has 2 divisors, whose sum is σ = 861481670. Its totient is φ = 861481668.

The previous prime is 861481657. The next prime is 861481703. The reversal of 861481669 is 966184168.

861481669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 833072769 + 28408900 = 28863^2 + 5330^2 .

It is a cyclic number.

It is not a de Polignac number, because 861481669 - 2⁵ = 861481637 is a prime.

It is a super-2 number, since 2×861481669² = 1484301332046051122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861481639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430740834 + 430740835.

It is an arithmetic number, because the mean of its divisors is an integer number (430740835).

Almost surely, 2^861481669 is an apocalyptic number.

It is an amenable number.

861481669 is a deficient number, since it is larger than the sum of its proper divisors (1).

861481669 is an equidigital number, since it uses as much as digits as its factorization.

861481669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 49.

The square root of 861481669 is about 29351.0079724700. The cubic root of 861481669 is about 951.5143599858.

The spelling of 861481669 in words is "eight hundred sixty-one million, four hundred eighty-one thousand, six hundred sixty-nine".