11912161 has 8 divisors (see below), whose sum is σ = 12283040. Its totient is φ = 11545632.

The previous prime is 11912129. The next prime is 11912171. The reversal of 11912161 is 16121911.

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 11912161 - 2⁵ = 11912129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11912101) 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, 4981 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (1535380).

Almost surely, 2^11912161 is an apocalyptic number.

11912161 is the 1993-rd octagonal number.

It is an amenable number.

11912161 is a deficient number, since it is larger than the sum of its proper divisors (370879).

11912161 is a wasteful number, since it uses less digits than its factorization.

11912161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175.

The product of its digits is 108, while the sum is 22.

The square root of 11912161 is about 3451.3998609260. The cubic root of 11912161 is about 228.3828657467.

The spelling of 11912161 in words is "eleven million, nine hundred twelve thousand, one hundred sixty-one".