11815649 has 2 divisors, whose sum is σ = 11815650. Its totient is φ = 11815648.

The previous prime is 11815633. The next prime is 11815711. The reversal of 11815649 is 94651811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11175649 + 640000 = 3343^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 11815649 - 2⁴ = 11815633 is a prime.

It is a super-2 number, since 2×11815649² = 279219122582402, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11815949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5907824 + 5907825.

It is an arithmetic number, because the mean of its divisors is an integer number (5907825).

Almost surely, 2^11815649 is an apocalyptic number.

It is an amenable number.

11815649 is a deficient number, since it is larger than the sum of its proper divisors (1).

11815649 is an equidigital number, since it uses as much as digits as its factorization.

11815649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 35.

The square root of 11815649 is about 3437.3898527807. The cubic root of 11815649 is about 227.7644085925.

The spelling of 11815649 in words is "eleven million, eight hundred fifteen thousand, six hundred forty-nine".