516389891 has 2 divisors, whose sum is σ = 516389892. Its totient is φ = 516389890.

The previous prime is 516389873. The next prime is 516389897. The reversal of 516389891 is 198983615.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 516389891 - 2¹⁰ = 516388867 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (516389897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258194945 + 258194946.

It is an arithmetic number, because the mean of its divisors is an integer number (258194946).

Almost surely, 2^516389891 is an apocalyptic number.

516389891 is a deficient number, since it is larger than the sum of its proper divisors (1).

516389891 is an equidigital number, since it uses as much as digits as its factorization.

516389891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 50.

The square root of 516389891 is about 22724.2137597762. The cubic root of 516389891 is about 802.2798979718.

The spelling of 516389891 in words is "five hundred sixteen million, three hundred eighty-nine thousand, eight hundred ninety-one".