905408089 has 2 divisors, whose sum is σ = 905408090. Its totient is φ = 905408088.

The previous prime is 905408081. The next prime is 905408131. The reversal of 905408089 is 980804509.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756690064 + 148718025 = 27508^2 + 12195^2 .

It is a cyclic number.

It is not a de Polignac number, because 905408089 - 2³ = 905408081 is a prime.

It is not a weakly prime, because it can be changed into another prime (905408081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452704044 + 452704045.

It is an arithmetic number, because the mean of its divisors is an integer number (452704045).

Almost surely, 2^905408089 is an apocalyptic number.

It is an amenable number.

905408089 is a deficient number, since it is larger than the sum of its proper divisors (1).

905408089 is an equidigital number, since it uses as much as digits as its factorization.

905408089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 905408089 is about 30089.9998172150. Note that the first 3 decimals coincide. The cubic root of 905408089 is about 967.4193952527.

The spelling of 905408089 in words is "nine hundred five million, four hundred eight thousand, eighty-nine".