4431989 has 2 divisors, whose sum is σ = 4431990. Its totient is φ = 4431988.

The previous prime is 4431961. The next prime is 4431991. The reversal of 4431989 is 9891344.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3496900 + 935089 = 1870^2 + 967^2 .

It is a cyclic number.

It is not a de Polignac number, because 4431989 - 2⁸ = 4431733 is a prime.

It is a super-2 number, since 2×4431989² = 39285052992242, which contains 22 as substring.

Together with 4431991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4431949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2215994 + 2215995.

It is an arithmetic number, because the mean of its divisors is an integer number (2215995).

Almost surely, 2^4431989 is an apocalyptic number.

It is an amenable number.

4431989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4431989 is an equidigital number, since it uses as much as digits as its factorization.

4431989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 4431989 is about 2105.2289661697. The cubic root of 4431989 is about 164.2604057512.

The spelling of 4431989 in words is "four million, four hundred thirty-one thousand, nine hundred eighty-nine".