906505609 has 4 divisors (see below), whose sum is σ = 909458704. Its totient is φ = 903552516.

The previous prime is 906505571. The next prime is 906505619.

906505609 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 906505609 - 2¹⁵ = 906472841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (906505619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1476087 + ... + 1476700.

It is an arithmetic number, because the mean of its divisors is an integer number (227364676).

Almost surely, 2^906505609 is an apocalyptic number.

It is an amenable number.

906505609 is a deficient number, since it is larger than the sum of its proper divisors (2953095).

906505609 is a wasteful number, since it uses less digits than its factorization.

906505609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953094.

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 906505609 is about 30108.2315820774. The cubic root of 906505609 is about 967.8101337568.

The spelling of 906505609 in words is "nine hundred six million, five hundred five thousand, six hundred nine".