201220427809 has 2 divisors, whose sum is σ = 201220427810. Its totient is φ = 201220427808.

The previous prime is 201220427711. The next prime is 201220427813. The reversal of 201220427809 is 908724022102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115314576400 + 85905851409 = 339580^2 + 293097^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220427809 - 2³³ = 192630493217 is a prime.

It is a super-3 number, since 3×201220427809³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (201220427899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610213904 + 100610213905.

It is an arithmetic number, because the mean of its divisors is an integer number (100610213905).

Almost surely, 2^201220427809 is an apocalyptic number.

It is an amenable number.

201220427809 is a deficient number, since it is larger than the sum of its proper divisors (1).

201220427809 is an equidigital number, since it uses as much as digits as its factorization.

201220427809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 201220427809 in words is "two hundred one billion, two hundred twenty million, four hundred twenty-seven thousand, eight hundred nine".