11981941 has 2 divisors, whose sum is σ = 11981942. Its totient is φ = 11981940.

The previous prime is 11981929. The next prime is 11981971. The reversal of 11981941 is 14918911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9891025 + 2090916 = 3145^2 + 1446^2 .

It is a cyclic number.

It is not a de Polignac number, because 11981941 - 2⁵ = 11981909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11981897 and 11981906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11981911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5990970 + 5990971.

It is an arithmetic number, because the mean of its divisors is an integer number (5990971).

Almost surely, 2^11981941 is an apocalyptic number.

It is an amenable number.

11981941 is a deficient number, since it is larger than the sum of its proper divisors (1).

11981941 is an equidigital number, since it uses as much as digits as its factorization.

11981941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 34.

The square root of 11981941 is about 3461.4940415953. The cubic root of 11981941 is about 228.8279442148.

The spelling of 11981941 in words is "eleven million, nine hundred eighty-one thousand, nine hundred forty-one".