10921649 has 2 divisors, whose sum is σ = 10921650. Its totient is φ = 10921648.

The previous prime is 10921609. The next prime is 10921693. The reversal of 10921649 is 94612901.

10921649 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., 10608049 + 313600 = 3257^2 + 560^2 .

It is an emirp because it is prime and its reverse (94612901) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10921649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (10921609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5460824 + 5460825.

It is an arithmetic number, because the mean of its divisors is an integer number (5460825).

Almost surely, 2^10921649 is an apocalyptic number.

It is an amenable number.

10921649 is a deficient number, since it is larger than the sum of its proper divisors (1).

10921649 is an equidigital number, since it uses as much as digits as its factorization.

10921649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 10921649 is about 3304.7918240034. The cubic root of 10921649 is about 221.8687168491.

The spelling of 10921649 in words is "ten million, nine hundred twenty-one thousand, six hundred forty-nine".