11640649 has 2 divisors, whose sum is σ = 11640650. Its totient is φ = 11640648.

The previous prime is 11640623. The next prime is 11640677. The reversal of 11640649 is 94604611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10517049 + 1123600 = 3243^2 + 1060^2 .

It is an emirp because it is prime and its reverse (94604611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11640649 - 2¹⁵ = 11607881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11640649.

It is not a weakly prime, because it can be changed into another prime (11640619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5820324 + 5820325.

It is an arithmetic number, because the mean of its divisors is an integer number (5820325).

Almost surely, 2^11640649 is an apocalyptic number.

It is an amenable number.

11640649 is a deficient number, since it is larger than the sum of its proper divisors (1).

11640649 is an equidigital number, since it uses as much as digits as its factorization.

11640649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 11640649 is about 3411.8395331551. The cubic root of 11640649 is about 226.6343482853.

The spelling of 11640649 in words is "eleven million, six hundred forty thousand, six hundred forty-nine".