11661445 has 4 divisors (see below), whose sum is σ = 13993740. Its totient is φ = 9329152.

The previous prime is 11661407. The next prime is 11661449. The reversal of 11661445 is 54416611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2982529 + 8678916 = 1727^2 + 2946^2 .

It is a cyclic number.

It is not a de Polignac number, because 11661445 - 2⁷ = 11661317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661449) 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 3 ways as a sum of consecutive naturals, for example, 1166140 + ... + 1166149.

It is an arithmetic number, because the mean of its divisors is an integer number (3498435).

Almost surely, 2^11661445 is an apocalyptic number.

It is an amenable number.

11661445 is a deficient number, since it is larger than the sum of its proper divisors (2332295).

11661445 is an equidigital number, since it uses as much as digits as its factorization.

11661445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332294.

The product of its digits is 2880, while the sum is 28.

The square root of 11661445 is about 3414.8857960406. The cubic root of 11661445 is about 226.7692286243.

The spelling of 11661445 in words is "eleven million, six hundred sixty-one thousand, four hundred forty-five".