6650989 has 4 divisors (see below), whose sum is σ = 6674940. Its totient is φ = 6627040.

The previous prime is 6650971. The next prime is 6650993. The reversal of 6650989 is 9890566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3392964 + 3258025 = 1842^2 + 1805^2 .

It is a cyclic number.

It is not a de Polignac number, because 6650989 - 2¹⁷ = 6519917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6650909) 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, 11554 + ... + 12115.

It is an arithmetic number, because the mean of its divisors is an integer number (1668735).

Almost surely, 2^6650989 is an apocalyptic number.

It is an amenable number.

6650989 is a deficient number, since it is larger than the sum of its proper divisors (23951).

6650989 is a wasteful number, since it uses less digits than its factorization.

6650989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23950.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 6650989 is about 2578.9511433914. The cubic root of 6650989 is about 188.0595574848.

The spelling of 6650989 in words is "six million, six hundred fifty thousand, nine hundred eighty-nine".