611221 has 4 divisors (see below), whose sum is σ = 658252. Its totient is φ = 564192.

The previous prime is 611213. The next prime is 611257. The reversal of 611221 is 122116.

611221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 372100 + 239121 = 610^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 611221 - 2³ = 611213 is a prime.

It is a super-2 number, since 2×611221² = 747182221682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 47017 = 611221 / (6 + 1 + 1 + 2 + 2 + 1).

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611621) 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, 23496 + ... + 23521.

It is an arithmetic number, because the mean of its divisors is an integer number (164563).

2⁶¹¹²²¹ is an apocalyptic number.

It is an amenable number.

611221 is a deficient number, since it is larger than the sum of its proper divisors (47031).

611221 is a wasteful number, since it uses less digits than its factorization.

611221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47030.

The product of its digits is 24, while the sum is 13.

The square root of 611221 is about 781.8062419807. The cubic root of 611221 is about 84.8658090231.

Adding to 611221 its reverse (122116), we get a palindrome (733337).

The spelling of 611221 in words is "six hundred eleven thousand, two hundred twenty-one".