516221071 has 4 divisors (see below), whose sum is σ = 517058352. Its totient is φ = 515383792.

The previous prime is 516221059. The next prime is 516221117. The reversal of 516221071 is 170122615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-516221071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516221011) 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, 417715 + ... + 418948.

It is an arithmetic number, because the mean of its divisors is an integer number (129264588).

Almost surely, 2^516221071 is an apocalyptic number.

516221071 is a deficient number, since it is larger than the sum of its proper divisors (837281).

516221071 is an equidigital number, since it uses as much as digits as its factorization.

516221071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837280.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 516221071 is about 22720.4989161770. The cubic root of 516221071 is about 802.1924603870.

Adding to 516221071 its reverse (170122615), we get a palindrome (686343686).

The spelling of 516221071 in words is "five hundred sixteen million, two hundred twenty-one thousand, seventy-one".