9138561 has 8 divisors (see below), whose sum is σ = 12201504. Its totient is φ = 6084000.

The previous prime is 9138553. The next prime is 9138587. The reversal of 9138561 is 1658319.

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

It is not a de Polignac number, because 9138561 - 2³ = 9138553 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9138511) 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, 1186 + ... + 4436.

It is an arithmetic number, because the mean of its divisors is an integer number (1525188).

Almost surely, 2^9138561 is an apocalyptic number.

It is an amenable number.

9138561 is a deficient number, since it is larger than the sum of its proper divisors (3062943).

9138561 is a wasteful number, since it uses less digits than its factorization.

9138561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191.

The product of its digits is 6480, while the sum is 33.

The square root of 9138561 is about 3023.0052927509. The cubic root of 9138561 is about 209.0704264234.

The spelling of 9138561 in words is "nine million, one hundred thirty-eight thousand, five hundred sixty-one".