905561089 has 2 divisors, whose sum is σ = 905561090. Its totient is φ = 905561088.

The previous prime is 905561077. The next prime is 905561099. The reversal of 905561089 is 980165509.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 849431025 + 56130064 = 29145^2 + 7492^2 .

It is a cyclic number.

It is not a de Polignac number, because 905561089 - 2¹¹ = 905559041 is a prime.

It is not a weakly prime, because it can be changed into another prime (905561039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452780544 + 452780545.

It is an arithmetic number, because the mean of its divisors is an integer number (452780545).

Almost surely, 2^905561089 is an apocalyptic number.

It is an amenable number.

905561089 is a deficient number, since it is larger than the sum of its proper divisors (1).

905561089 is an equidigital number, since it uses as much as digits as its factorization.

905561089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 905561089 is about 30092.5420827154. The cubic root of 905561089 is about 967.4738851682.

The spelling of 905561089 in words is "nine hundred five million, five hundred sixty-one thousand, eighty-nine".