220908409 has 2 divisors, whose sum is σ = 220908410. Its totient is φ = 220908408.

The previous prime is 220908403. The next prime is 220908427. The reversal of 220908409 is 904809022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157753600 + 63154809 = 12560^2 + 7947^2 .

It is a cyclic number.

It is not a de Polignac number, because 220908409 - 2⁵ = 220908377 is a prime.

It is a super-2 number, since 2×220908409² = 97601050333822562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (220908403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110454204 + 110454205.

It is an arithmetic number, because the mean of its divisors is an integer number (110454205).

Almost surely, 2^220908409 is an apocalyptic number.

It is an amenable number.

220908409 is a deficient number, since it is larger than the sum of its proper divisors (1).

220908409 is an equidigital number, since it uses as much as digits as its factorization.

220908409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 220908409 is about 14862.9878893848. The cubic root of 220908409 is about 604.5108255837.

The spelling of 220908409 in words is "two hundred twenty million, nine hundred eight thousand, four hundred nine".