501506989 has 2 divisors, whose sum is σ = 501506990. Its totient is φ = 501506988.

The previous prime is 501506963. The next prime is 501507001. The reversal of 501506989 is 989605105.

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., 490976964 + 10530025 = 22158^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 501506989 - 2¹³ = 501498797 is a prime.

It is a super-2 number, since 2×501506989² = 503018520031692242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501506959) 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, 250753494 + 250753495.

It is an arithmetic number, because the mean of its divisors is an integer number (250753495).

Almost surely, 2^501506989 is an apocalyptic number.

It is an amenable number.

501506989 is a deficient number, since it is larger than the sum of its proper divisors (1).

501506989 is an equidigital number, since it uses as much as digits as its factorization.

501506989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 501506989 is about 22394.3517209139. The cubic root of 501506989 is about 794.4971248501.

The spelling of 501506989 in words is "five hundred one million, five hundred six thousand, nine hundred eighty-nine".