11643949 has 2 divisors, whose sum is σ = 11643950. Its totient is φ = 11643948.

The previous prime is 11643923. The next prime is 11643953. The reversal of 11643949 is 94934611.

11643949 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., 6215049 + 5428900 = 2493^2 + 2330^2 .

It is an emirp because it is prime and its reverse (94934611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11643949 - 2¹¹ = 11641901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11643449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5821974 + 5821975.

It is an arithmetic number, because the mean of its divisors is an integer number (5821975).

Almost surely, 2^11643949 is an apocalyptic number.

It is an amenable number.

11643949 is a deficient number, since it is larger than the sum of its proper divisors (1).

11643949 is an equidigital number, since it uses as much as digits as its factorization.

11643949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 11643949 is about 3412.3231089684. The cubic root of 11643949 is about 226.6557624032.

The spelling of 11643949 in words is "eleven million, six hundred forty-three thousand, nine hundred forty-nine".