11821913 has 2 divisors, whose sum is σ = 11821914. Its totient is φ = 11821912.

The previous prime is 11821903. The next prime is 11821961. The reversal of 11821913 is 31912811.

11821913 is digitally balanced in base 2, 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., 9223369 + 2598544 = 3037^2 + 1612^2 .

It is a cyclic number.

It is not a de Polignac number, because 11821913 - 2¹⁴ = 11805529 is a prime.

It is not a weakly prime, because it can be changed into another prime (11821903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5910956 + 5910957.

It is an arithmetic number, because the mean of its divisors is an integer number (5910957).

Almost surely, 2^11821913 is an apocalyptic number.

It is an amenable number.

11821913 is a deficient number, since it is larger than the sum of its proper divisors (1).

11821913 is an equidigital number, since it uses as much as digits as its factorization.

11821913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 26.

The square root of 11821913 is about 3438.3008885204. The cubic root of 11821913 is about 227.8046508228.

The spelling of 11821913 in words is "eleven million, eight hundred twenty-one thousand, nine hundred thirteen".