10921609 has 2 divisors, whose sum is σ = 10921610. Its totient is φ = 10921608.

The previous prime is 10921591. The next prime is 10921649. The reversal of 10921609 is 90612901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8248384 + 2673225 = 2872^2 + 1635^2 .

It is an emirp because it is prime and its reverse (90612901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10921609 - 2⁵ = 10921577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10921649) 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, 5460804 + 5460805.

It is an arithmetic number, because the mean of its divisors is an integer number (5460805).

Almost surely, 2^10921609 is an apocalyptic number.

It is an amenable number.

10921609 is a deficient number, since it is larger than the sum of its proper divisors (1).

10921609 is an equidigital number, since it uses as much as digits as its factorization.

10921609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 10921609 is about 3304.7857721795. The cubic root of 10921609 is about 221.8684459877.

It can be divided in two parts, 1092 and 1609, that added together give a triangular number (2701 = T₇₃).

The spelling of 10921609 in words is "ten million, nine hundred twenty-one thousand, six hundred nine".