516321989 has 2 divisors, whose sum is σ = 516321990. Its totient is φ = 516321988.

The previous prime is 516321913. The next prime is 516321997. The reversal of 516321989 is 989123615.

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., 269517889 + 246804100 = 16417^2 + 15710^2 .

It is a cyclic number.

It is not a de Polignac number, because 516321989 - 2¹⁶ = 516256453 is a prime.

It is a super-2 number, since 2×516321989² = 533176792649832242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (516326989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258160994 + 258160995.

It is an arithmetic number, because the mean of its divisors is an integer number (258160995).

Almost surely, 2^516321989 is an apocalyptic number.

It is an amenable number.

516321989 is a deficient number, since it is larger than the sum of its proper divisors (1).

516321989 is an equidigital number, since it uses as much as digits as its factorization.

516321989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 44.

The square root of 516321989 is about 22722.7196655682. The cubic root of 516321989 is about 802.2447315220.

The spelling of 516321989 in words is "five hundred sixteen million, three hundred twenty-one thousand, nine hundred eighty-nine".