905009489 has 2 divisors, whose sum is σ = 905009490. Its totient is φ = 905009488.

The previous prime is 905009477. The next prime is 905009491. The reversal of 905009489 is 984900509.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 842915089 + 62094400 = 29033^2 + 7880^2 .

It is a cyclic number.

It is not a de Polignac number, because 905009489 - 2⁴ = 905009473 is a prime.

It is a super-2 number, since 2×905009489² = 1638084350360082242, which contains 22 as substring.

Together with 905009491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (905069489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452504744 + 452504745.

It is an arithmetic number, because the mean of its divisors is an integer number (452504745).

Almost surely, 2^905009489 is an apocalyptic number.

It is an amenable number.

905009489 is a deficient number, since it is larger than the sum of its proper divisors (1).

905009489 is an equidigital number, since it uses as much as digits as its factorization.

905009489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 905009489 is about 30083.3756250857. The cubic root of 905009489 is about 967.2774077234.

The spelling of 905009489 in words is "nine hundred five million, nine thousand, four hundred eighty-nine".