11670561 has 28 divisors (see below), whose sum is σ = 20006272. Its totient is φ = 6665976.

The previous prime is 11670559. The next prime is 11670563. The reversal of 11670561 is 16507611.

It is an interprime number because it is at equal distance from previous prime (11670559) and next prime (11670563).

It is not a de Polignac number, because 11670561 - 2¹ = 11670559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11670563) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3960 + ... + 6246.

Almost surely, 2^11670561 is an apocalyptic number.

It is an amenable number.

11670561 is a deficient number, since it is larger than the sum of its proper divisors (8335711).

11670561 is an frugal number, since it uses more digits than its factorization.

11670561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312 (or 2297 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 11670561 is about 3416.2202797829. The cubic root of 11670561 is about 226.8283033461.

The spelling of 11670561 in words is "eleven million, six hundred seventy thousand, five hundred sixty-one".