516821489 has 4 divisors (see below), whose sum is σ = 544022640. Its totient is φ = 489620340.

The previous prime is 516821479. The next prime is 516821551. The reversal of 516821489 is 984128615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 984128615 = 5 ⋅196825723.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-516821489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (516821479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13600547 + ... + 13600584.

It is an arithmetic number, because the mean of its divisors is an integer number (136005660).

Almost surely, 2^516821489 is an apocalyptic number.

It is an amenable number.

516821489 is a deficient number, since it is larger than the sum of its proper divisors (27201151).

516821489 is a wasteful number, since it uses less digits than its factorization.

516821489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27201150.

The product of its digits is 138240, while the sum is 44.

The square root of 516821489 is about 22733.7082104966. The cubic root of 516821489 is about 802.5033505617.

It can be divided in two parts, 516 and 821489, that multiplied together give a palindrome (423888324).

The spelling of 516821489 in words is "five hundred sixteen million, eight hundred twenty-one thousand, four hundred eighty-nine".