906656689 has 4 divisors (see below), whose sum is σ = 915130224. Its totient is φ = 898183156.

The previous prime is 906656627. The next prime is 906656713. The reversal of 906656689 is 986656609.

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, and also an emirpimes, since its reverse is a distinct semiprime: 986656609 = 157 ⋅6284437.

It is a cyclic number.

It is not a de Polignac number, because 906656689 - 2¹⁷ = 906525617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (906656089) 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, 4236607 + ... + 4236820.

It is an arithmetic number, because the mean of its divisors is an integer number (228782556).

Almost surely, 2^906656689 is an apocalyptic number.

It is an amenable number.

906656689 is a deficient number, since it is larger than the sum of its proper divisors (8473535).

906656689 is a wasteful number, since it uses less digits than its factorization.

906656689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8473534.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The square root of 906656689 is about 30110.7404259676. The cubic root of 906656689 is about 967.8638964809.

The spelling of 906656689 in words is "nine hundred six million, six hundred fifty-six thousand, six hundred eighty-nine".