861306981 has 8 divisors (see below), whose sum is σ = 1149021024. Its totient is φ = 573898800.

The previous prime is 861306937. The next prime is 861307021. The reversal of 861306981 is 189603168.

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

It is not a de Polignac number, because 861306981 - 2¹⁰ = 861305957 is a prime.

It is a super-2 number, since 2×861306981² = 1483699431038668722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861306881) 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 in 7 ways as a sum of consecutive naturals, for example, 69811 + ... + 81216.

It is an arithmetic number, because the mean of its divisors is an integer number (143627628).

Almost surely, 2^861306981 is an apocalyptic number.

It is an amenable number.

861306981 is a deficient number, since it is larger than the sum of its proper divisors (287714043).

861306981 is a wasteful number, since it uses less digits than its factorization.

861306981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152931.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 861306981 is about 29348.0319783116. The cubic root of 861306981 is about 951.4500408084.

The spelling of 861306981 in words is "eight hundred sixty-one million, three hundred six thousand, nine hundred eighty-one".