612221 has 4 divisors (see below), whose sum is σ = 648252. Its totient is φ = 576192.

The previous prime is 612217. The next prime is 612223. The reversal of 612221 is 122216.

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

It can be written as a sum of positive squares in 2 ways, for example, as 376996 + 235225 = 614^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 612221 - 2² = 612217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 612196 and 612205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17990 + ... + 18023.

It is an arithmetic number, because the mean of its divisors is an integer number (162063).

2⁶¹²²²¹ is an apocalyptic number.

It is an amenable number.

612221 is a deficient number, since it is larger than the sum of its proper divisors (36031).

612221 is a wasteful number, since it uses less digits than its factorization.

612221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36030.

The product of its digits is 48, while the sum is 14.

The square root of 612221 is about 782.4455252604. The cubic root of 612221 is about 84.9120659247.

Adding to 612221 its reverse (122216), we get a palindrome (734437).

The spelling of 612221 in words is "six hundred twelve thousand, two hundred twenty-one".