11191649 has 12 divisors (see below), whose sum is σ = 13372884. Its totient is φ = 9332064.

The previous prime is 11191603. The next prime is 11191657. The reversal of 11191649 is 94619111.

It can be written as a sum of positive squares in 2 ways, for example, as 4264225 + 6927424 = 2065^2 + 2632^2 .

It is not a de Polignac number, because 11191649 - 2¹⁶ = 11126113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11191669) 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 in 11 ways as a sum of consecutive naturals, for example, 1274 + ... + 4899.

It is an arithmetic number, because the mean of its divisors is an integer number (1114407).

Almost surely, 2^11191649 is an apocalyptic number.

It is an amenable number.

11191649 is a deficient number, since it is larger than the sum of its proper divisors (2181235).

11191649 is an equidigital number, since it uses as much as digits as its factorization.

11191649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6224 (or 6217 counting only the distinct ones).

The product of its digits is 1944, while the sum is 32.

The square root of 11191649 is about 3345.3922042116. The cubic root of 11191649 is about 223.6821664268.

The spelling of 11191649 in words is "eleven million, one hundred ninety-one thousand, six hundred forty-nine".