9015561 has 12 divisors (see below), whose sum is σ = 13050180. Its totient is φ = 5997600.

The previous prime is 9015553. The next prime is 9015577. The reversal of 9015561 is 1655109.

9015561 is a `hidden beast` number, since 90 + 15 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3980025 + 5035536 = 1995^2 + 2244^2 .

It is not a de Polignac number, because 9015561 - 2³ = 9015553 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (9015511) 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, 5595 + ... + 7023.

It is an arithmetic number, because the mean of its divisors is an integer number (1087515).

Almost surely, 2^9015561 is an apocalyptic number.

It is an amenable number.

9015561 is a deficient number, since it is larger than the sum of its proper divisors (4034619).

9015561 is a wasteful number, since it uses less digits than its factorization.

9015561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2133 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 9015561 is about 3002.5923799277. The cubic root of 9015561 is about 208.1281954437.

It can be divided in two parts, 90 and 15561, that added together give a palindrome (15651).

The spelling of 9015561 in words is "nine million, fifteen thousand, five hundred sixty-one".