6627989 has 2 divisors, whose sum is σ = 6627990. Its totient is φ = 6627988.

The previous prime is 6627949. The next prime is 6627991. The reversal of 6627989 is 9897266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4695889 + 1932100 = 2167^2 + 1390^2 .

It is a cyclic number.

It is not a de Polignac number, because 6627989 - 2¹² = 6623893 is a prime.

Together with 6627991, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6627949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3313994 + 3313995.

It is an arithmetic number, because the mean of its divisors is an integer number (3313995).

Almost surely, 2^6627989 is an apocalyptic number.

It is an amenable number.

6627989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6627989 is an equidigital number, since it uses as much as digits as its factorization.

6627989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 6627989 is about 2574.4881044588. The cubic root of 6627989 is about 187.8425288432.

The spelling of 6627989 in words is "six million, six hundred twenty-seven thousand, nine hundred eighty-nine".