5663989 has 2 divisors, whose sum is σ = 5663990. Its totient is φ = 5663988.

The previous prime is 5663969. The next prime is 5663993. The reversal of 5663989 is 9893665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5616900 + 47089 = 2370^2 + 217^2 .

It is a cyclic number.

It is not a de Polignac number, because 5663989 - 2⁹ = 5663477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5663909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2831994 + 2831995.

It is an arithmetic number, because the mean of its divisors is an integer number (2831995).

Almost surely, 2^5663989 is an apocalyptic number.

It is an amenable number.

5663989 is a deficient number, since it is larger than the sum of its proper divisors (1).

5663989 is an equidigital number, since it uses as much as digits as its factorization.

5663989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 46.

The square root of 5663989 is about 2379.9136538959. The cubic root of 5663989 is about 178.2546223427.

The spelling of 5663989 in words is "five million, six hundred sixty-three thousand, nine hundred eighty-nine".