8561961 has 12 divisors (see below), whose sum is σ = 12542400. Its totient is φ = 5627160.

The previous prime is 8561953. The next prime is 8561963. The reversal of 8561961 is 1691658.

8561961 is a `hidden beast` number, since 8 + 561 + 96 + 1 = 666.

It is not a de Polignac number, because 8561961 - 2³ = 8561953 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8561963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6061 + ... + 7338.

It is an arithmetic number, because the mean of its divisors is an integer number (1045200).

Almost surely, 2^8561961 is an apocalyptic number.

It is an amenable number.

8561961 is a deficient number, since it is larger than the sum of its proper divisors (3980439).

8561961 is a wasteful number, since it uses less digits than its factorization.

8561961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13476 (or 13473 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 8561961 is about 2926.0828764750. The cubic root of 8561961 is about 204.5774441012.

The spelling of 8561961 in words is "eight million, five hundred sixty-one thousand, nine hundred sixty-one".