11430781 has 2 divisors, whose sum is σ = 11430782. Its totient is φ = 11430780.

The previous prime is 11430779. The next prime is 11430827. The reversal of 11430781 is 18703411.

11430781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10692900 + 737881 = 3270^2 + 859^2 .

It is an emirp because it is prime and its reverse (18703411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11430781 - 2¹ = 11430779 is a prime.

It is a super-2 number, since 2×11430781² = 261325508539922, which contains 22 as substring.

Together with 11430779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11430481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5715390 + 5715391.

It is an arithmetic number, because the mean of its divisors is an integer number (5715391).

Almost surely, 2^11430781 is an apocalyptic number.

It is an amenable number.

11430781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11430781 is an equidigital number, since it uses as much as digits as its factorization.

11430781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 11430781 is about 3380.9438031414. The cubic root of 11430781 is about 225.2640915499.

The spelling of 11430781 in words is "eleven million, four hundred thirty thousand, seven hundred eighty-one".