8961981 has 8 divisors (see below), whose sum is σ = 13656384. Its totient is φ = 5121120.

The previous prime is 8961961. The next prime is 8961983. The reversal of 8961981 is 1891698.

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

It is not a de Polignac number, because 8961981 - 2¹⁵ = 8929213 is a prime.

It is a super-2 number, since 2×8961981² = 160634206888722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8961983) 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, 213360 + ... + 213401.

It is an arithmetic number, because the mean of its divisors is an integer number (1707048).

Almost surely, 2^8961981 is an apocalyptic number.

It is an amenable number.

8961981 is a deficient number, since it is larger than the sum of its proper divisors (4694403).

8961981 is a wasteful number, since it uses less digits than its factorization.

8961981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426771.

The product of its digits is 31104, while the sum is 42.

The square root of 8961981 is about 2993.6567939562. The cubic root of 8961981 is about 207.7150699860.

The spelling of 8961981 in words is "eight million, nine hundred sixty-one thousand, nine hundred eighty-one".