861184972961 has 8 divisors (see below), whose sum is σ = 862430797800. Its totient is φ = 859939597440.

The previous prime is 861184972951. The next prime is 861184972969. The reversal of 861184972961 is 169279481168.

It can be written as a sum of positive squares in 4 ways, for example, as 739847700736 + 121337272225 = 860144^2 + 348335^2 .

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 861184972961 - 2⁶ = 861184972897 is a prime.

It is a super-2 number, since 2×861184972961² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861184972894 and 861184972903.

It is not an unprimeable number, because it can be changed into a prime (861184972969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3823055 + ... + 4042043.

It is an arithmetic number, because the mean of its divisors is an integer number (107803849725).

Almost surely, 2^861184972961 is an apocalyptic number.

It is an amenable number.

861184972961 is a deficient number, since it is larger than the sum of its proper divisors (1245824839).

861184972961 is a wasteful number, since it uses less digits than its factorization.

861184972961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224659.

The product of its digits is 10450944, while the sum is 62.

The spelling of 861184972961 in words is "eight hundred sixty-one billion, one hundred eighty-four million, nine hundred seventy-two thousand, nine hundred sixty-one".