441551989 has 2 divisors, whose sum is σ = 441551990. Its totient is φ = 441551988.

The previous prime is 441551947. The next prime is 441552019. The reversal of 441551989 is 989155144.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380055025 + 61496964 = 19495^2 + 7842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-441551989 is a prime.

It is a super-2 number, since 2×441551989² = 389936317979712242, 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 (441551389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220775994 + 220775995.

It is an arithmetic number, because the mean of its divisors is an integer number (220775995).

Almost surely, 2^441551989 is an apocalyptic number.

It is an amenable number.

441551989 is a deficient number, since it is larger than the sum of its proper divisors (1).

441551989 is an equidigital number, since it uses as much as digits as its factorization.

441551989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 46.

The square root of 441551989 is about 21013.1384852430. The cubic root of 441551989 is about 761.4837064729.

The spelling of 441551989 in words is "four hundred forty-one million, five hundred fifty-one thousand, nine hundred eighty-nine".