5161221 has 24 divisors (see below), whose sum is σ = 8293376. Its totient is φ = 3071520.

The previous prime is 5161187. The next prime is 5161229. The reversal of 5161221 is 1221615.

5161221 is a `hidden beast` number, since 51 + 612 + 2 + 1 = 666.

It is not a de Polignac number, because 5161221 - 2¹⁴ = 5144837 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5161194 and 5161203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5161229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2916 + ... + 4338.

Almost surely, 2^5161221 is an apocalyptic number.

It is an amenable number.

5161221 is a deficient number, since it is larger than the sum of its proper divisors (3132155).

5161221 is a wasteful number, since it uses less digits than its factorization.

5161221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473 (or 1470 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 5161221 is about 2271.8320800623. The cubic root of 5161221 is about 172.8160808401.

Adding to 5161221 its reverse (1221615), we get a palindrome (6382836).

It can be divided in two parts, 516 and 1221, that multiplied together give a palindrome (630036).

The spelling of 5161221 in words is "five million, one hundred sixty-one thousand, two hundred twenty-one".