9181561 has 8 divisors (see below), whose sum is σ = 9414144. Its totient is φ = 8951280.

The previous prime is 9181553. The next prime is 9181573. The reversal of 9181561 is 1651819.

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 9181561 - 2³ = 9181553 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9181511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9670 + ... + 10576.

It is an arithmetic number, because the mean of its divisors is an integer number (1176768).

Almost surely, 2^9181561 is an apocalyptic number.

It is an amenable number.

9181561 is a deficient number, since it is larger than the sum of its proper divisors (232583).

9181561 is a wasteful number, since it uses less digits than its factorization.

9181561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151.

The product of its digits is 2160, while the sum is 31.

The square root of 9181561 is about 3030.1090739444. The cubic root of 9181561 is about 209.3978289803.

The spelling of 9181561 in words is "nine million, one hundred eighty-one thousand, five hundred sixty-one".