11977081 has 4 divisors (see below), whose sum is σ = 11986164. Its totient is φ = 11968000.

The previous prime is 11977039. The next prime is 11977109. The reversal of 11977081 is 18077911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18077911 = 19 ⋅951469.

It can be written as a sum of positive squares in 2 ways, for example, as 11451456 + 525625 = 3384^2 + 725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11977081 is a prime.

It is a super-2 number, since 2×11977081² = 286900938561122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11977681) 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 3 ways as a sum of consecutive naturals, for example, 2140 + ... + 5341.

It is an arithmetic number, because the mean of its divisors is an integer number (2996541).

Almost surely, 2^11977081 is an apocalyptic number.

It is an amenable number.

11977081 is a deficient number, since it is larger than the sum of its proper divisors (9083).

11977081 is an equidigital number, since it uses as much as digits as its factorization.

11977081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9082.

The product of its (nonzero) digits is 3528, while the sum is 34.

The square root of 11977081 is about 3460.7919613869. The cubic root of 11977081 is about 228.7970016988.

The spelling of 11977081 in words is "eleven million, nine hundred seventy-seven thousand, eighty-one".