11972181 has 16 divisors (see below), whose sum is σ = 17257856. Its totient is φ = 7338816.

The previous prime is 11972171. The next prime is 11972183. The reversal of 11972181 is 18127911.

11972181 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11972181 - 2⁹ = 11971669 is a prime.

It is a super-2 number, since 2×11972181² = 286666235793522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11972183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14136 + ... + 14958.

It is an arithmetic number, because the mean of its divisors is an integer number (1078616).

Almost surely, 2^11972181 is an apocalyptic number.

It is an amenable number.

11972181 is a deficient number, since it is larger than the sum of its proper divisors (5285675).

11972181 is a wasteful number, since it uses less digits than its factorization.

11972181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212.

The product of its digits is 1008, while the sum is 30.

The square root of 11972181 is about 3460.0839585189. The cubic root of 11972181 is about 228.7657960366.

The spelling of 11972181 in words is "eleven million, nine hundred seventy-two thousand, one hundred eighty-one".