11914781 has 2 divisors, whose sum is σ = 11914782. Its totient is φ = 11914780.

The previous prime is 11914751. The next prime is 11914789. The reversal of 11914781 is 18741911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9765625 + 2149156 = 3125^2 + 1466^2 .

It is an emirp because it is prime and its reverse (18741911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11914781 - 2⁶ = 11914717 is a prime.

It is a super-2 number, since 2×11914781² = 283924012555922, which contains 22 as substring.

It is a Chen prime.

It is equal to p₇₈₂₈₀₇ and since 11914781 and 782807 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11914789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5957390 + 5957391.

It is an arithmetic number, because the mean of its divisors is an integer number (5957391).

Almost surely, 2^11914781 is an apocalyptic number.

It is an amenable number.

11914781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11914781 is an equidigital number, since it uses as much as digits as its factorization.

11914781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 32.

The square root of 11914781 is about 3451.7793961955. The cubic root of 11914781 is about 228.3996082797.

The spelling of 11914781 in words is "eleven million, nine hundred fourteen thousand, seven hundred eighty-one".