501441989 has 2 divisors, whose sum is σ = 501441990. Its totient is φ = 501441988.

The previous prime is 501441961. The next prime is 501442001. The reversal of 501441989 is 989144105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400600225 + 100841764 = 20015^2 + 10042^2 .

It is a cyclic number.

It is not a de Polignac number, because 501441989 - 2¹⁶ = 501376453 is a prime.

It is a super-2 number, since 2×501441989² = 502888136664552242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501444989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250720994 + 250720995.

It is an arithmetic number, because the mean of its divisors is an integer number (250720995).

Almost surely, 2^501441989 is an apocalyptic number.

It is an amenable number.

501441989 is a deficient number, since it is larger than the sum of its proper divisors (1).

501441989 is an equidigital number, since it uses as much as digits as its factorization.

501441989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 501441989 is about 22392.9004150869. The cubic root of 501441989 is about 794.4627986124.

The spelling of 501441989 in words is "five hundred one million, four hundred forty-one thousand, nine hundred eighty-nine".