2212955809 has 4 divisors (see below), whose sum is σ = 2289264660. Its totient is φ = 2136646960.

The previous prime is 2212955803. The next prime is 2212955839. The reversal of 2212955809 is 9085592122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9085592122 = 2 ⋅4542796061.

It can be written as a sum of positive squares in 2 ways, for example, as 1308630625 + 904325184 = 36175^2 + 30072^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212955809 - 2¹⁹ = 2212431521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2212955803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38154382 + ... + 38154439.

It is an arithmetic number, because the mean of its divisors is an integer number (572316165).

Almost surely, 2^2212955809 is an apocalyptic number.

2212955809 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2212955809 is a deficient number, since it is larger than the sum of its proper divisors (76308851).

2212955809 is an equidigital number, since it uses as much as digits as its factorization.

2212955809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76308850.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 2212955809 is about 47042.0642510509. The cubic root of 2212955809 is about 1303.1395143018.

The spelling of 2212955809 in words is "two billion, two hundred twelve million, nine hundred fifty-five thousand, eight hundred nine".