5166821 has 6 divisors (see below), whose sum is σ = 5679366. Its totient is φ = 4697000.

The previous prime is 5166817. The next prime is 5166829. The reversal of 5166821 is 1286615.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5085025 + 81796 = 2255^2 + 286^2 .

It is not a de Polignac number, because 5166821 - 2² = 5166817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5166829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21230 + ... + 21471.

It is an arithmetic number, because the mean of its divisors is an integer number (946561).

Almost surely, 2^5166821 is an apocalyptic number.

It is an amenable number.

5166821 is a deficient number, since it is larger than the sum of its proper divisors (512545).

5166821 is a wasteful number, since it uses less digits than its factorization.

5166821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42723 (or 42712 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 5166821 is about 2273.0642313846. The cubic root of 5166821 is about 172.8785609037.

It can be divided in two parts, 516 and 6821, that added together give a palindrome (7337).

The spelling of 5166821 in words is "five million, one hundred sixty-six thousand, eight hundred twenty-one".