11540981 has 2 divisors, whose sum is σ = 11540982. Its totient is φ = 11540980.

The previous prime is 11540957. The next prime is 11540983. The reversal of 11540981 is 18904511.

11540981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10666756 + 874225 = 3266^2 + 935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11540981 is a prime.

It is a super-2 number, since 2×11540981² = 266388484884722, which contains 22 as substring.

Together with 11540983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11540983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5770490 + 5770491.

It is an arithmetic number, because the mean of its divisors is an integer number (5770491).

Almost surely, 2^11540981 is an apocalyptic number.

It is an amenable number.

11540981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11540981 is an equidigital number, since it uses as much as digits as its factorization.

11540981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 11540981 is about 3397.2019368887. The cubic root of 11540981 is about 225.9856740338.

It can be divided in two parts, 11540 and 981, that added together give a palindrome (12521).

The spelling of 11540981 in words is "eleven million, five hundred forty thousand, nine hundred eighty-one".