10920209 has 2 divisors, whose sum is σ = 10920210. Its totient is φ = 10920208.

The previous prime is 10920191. The next prime is 10920223. The reversal of 10920209 is 90202901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7441984 + 3478225 = 2728^2 + 1865^2 .

It is a cyclic number.

It is not a de Polignac number, because 10920209 - 2²⁰ = 9871633 is a prime.

It is equal to p₇₂₁₅₈₀ and since 10920209 and 721580 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (10920229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5460104 + 5460105.

It is an arithmetic number, because the mean of its divisors is an integer number (5460105).

Almost surely, 2^10920209 is an apocalyptic number.

It is an amenable number.

10920209 is a deficient number, since it is larger than the sum of its proper divisors (1).

10920209 is an equidigital number, since it uses as much as digits as its factorization.

10920209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 10920209 is about 3304.5739513589. The cubic root of 10920209 is about 221.8589654219.

The spelling of 10920209 in words is "ten million, nine hundred twenty thousand, two hundred nine".