11661071 has 4 divisors (see below), whose sum is σ = 11679072. Its totient is φ = 11643072.

The previous prime is 11661061. The next prime is 11661073. The reversal of 11661071 is 17016611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17016611 = 397 ⋅42863.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11661071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7991 + ... + 9336.

It is an arithmetic number, because the mean of its divisors is an integer number (2919768).

Almost surely, 2^11661071 is an apocalyptic number.

11661071 is a deficient number, since it is larger than the sum of its proper divisors (18001).

11661071 is an equidigital number, since it uses as much as digits as its factorization.

11661071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18000.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 11661071 is about 3414.8310353515. The cubic root of 11661071 is about 226.7668043222.

Adding to 11661071 its reverse (17016611), we get a palindrome (28677682).

The spelling of 11661071 in words is "eleven million, six hundred sixty-one thousand, seventy-one".