6611989 has 2 divisors, whose sum is σ = 6611990. Its totient is φ = 6611988.

The previous prime is 6611951. The next prime is 6611993. The reversal of 6611989 is 9891166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6589489 + 22500 = 2567^2 + 150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6611989 is a prime.

It is a super-2 number, since 2×6611989² = 87436797072242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6611389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305994 + 3305995.

It is an arithmetic number, because the mean of its divisors is an integer number (3305995).

Almost surely, 2^6611989 is an apocalyptic number.

It is an amenable number.

6611989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6611989 is an equidigital number, since it uses as much as digits as its factorization.

6611989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 40.

The square root of 6611989 is about 2571.3788130106. The cubic root of 6611989 is about 187.6912561055.

The spelling of 6611989 in words is "six million, six hundred eleven thousand, nine hundred eighty-nine".