409228081 has 2 divisors, whose sum is σ = 409228082. Its totient is φ = 409228080.

The previous prime is 409228069. The next prime is 409228087. The reversal of 409228081 is 180822904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374229025 + 34999056 = 19345^2 + 5916^2 .

It is a cyclic number.

It is not a de Polignac number, because 409228081 - 2¹¹ = 409226033 is a prime.

It is a super-2 number, since 2×409228081² = 334935244557885122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (409228087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204614040 + 204614041.

It is an arithmetic number, because the mean of its divisors is an integer number (204614041).

Almost surely, 2^409228081 is an apocalyptic number.

It is an amenable number.

409228081 is a deficient number, since it is larger than the sum of its proper divisors (1).

409228081 is an equidigital number, since it uses as much as digits as its factorization.

409228081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 409228081 is about 20229.3865700372. The cubic root of 409228081 is about 742.4293673056.

The spelling of 409228081 in words is "four hundred nine million, two hundred twenty-eight thousand, eighty-one".