11767981 has 2 divisors, whose sum is σ = 11767982. Its totient is φ = 11767980.

The previous prime is 11767969. The next prime is 11767993. The reversal of 11767981 is 18976711.

11767981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (11767969) and next prime (11767993).

It can be written as a sum of positive squares in only one way, i.e., 9821956 + 1946025 = 3134^2 + 1395^2 .

It is a cyclic number.

It is not a de Polignac number, because 11767981 - 2²³ = 3379373 is a prime.

It is a super-2 number, since 2×11767981² = 276970753632722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11767901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5883990 + 5883991.

It is an arithmetic number, because the mean of its divisors is an integer number (5883991).

Almost surely, 2^11767981 is an apocalyptic number.

It is an amenable number.

11767981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11767981 is an equidigital number, since it uses as much as digits as its factorization.

11767981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 40.

The square root of 11767981 is about 3430.4490959640. The cubic root of 11767981 is about 227.4577049739.

The spelling of 11767981 in words is "eleven million, seven hundred sixty-seven thousand, nine hundred eighty-one".