11672561 has 8 divisors (see below), whose sum is σ = 12004200. Its totient is φ = 11345152.

The previous prime is 11672513. The next prime is 11672579. The reversal of 11672561 is 16527611.

It can be written as a sum of positive squares in 4 ways, for example, as 1336336 + 10336225 = 1156^2 + 3215^2 .

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 11672561 - 2²² = 7478257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11672581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5015 + ... + 6963.

It is an arithmetic number, because the mean of its divisors is an integer number (1500525).

Almost surely, 2^11672561 is an apocalyptic number.

It is an amenable number.

11672561 is a deficient number, since it is larger than the sum of its proper divisors (331639).

11672561 is a wasteful number, since it uses less digits than its factorization.

11672561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115.

The product of its digits is 2520, while the sum is 29.

The square root of 11672561 is about 3416.5129884138. The cubic root of 11672561 is about 226.8412598982.

The spelling of 11672561 in words is "eleven million, six hundred seventy-two thousand, five hundred sixty-one".