861361693 has 8 divisors (see below), whose sum is σ = 867503448. Its totient is φ = 855242304.

The previous prime is 861361679. The next prime is 861361717. The reversal of 861361693 is 396163168.

It can be written as a sum of positive squares in 4 ways, for example, as 497200804 + 364160889 = 22298^2 + 19083^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861361693 - 2¹⁷ = 861230621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861361643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75855 + ... + 86467.

It is an arithmetic number, because the mean of its divisors is an integer number (108437931).

Almost surely, 2^861361693 is an apocalyptic number.

It is an amenable number.

861361693 is a deficient number, since it is larger than the sum of its proper divisors (6141755).

861361693 is a wasteful number, since it uses less digits than its factorization.

861361693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11183.

The product of its digits is 139968, while the sum is 43.

The square root of 861361693 is about 29348.9640873405. The cubic root of 861361693 is about 951.4701864064.

The spelling of 861361693 in words is "eight hundred sixty-one million, three hundred sixty-one thousand, six hundred ninety-three".