1611221 has 4 divisors (see below), whose sum is σ = 1613952. Its totient is φ = 1608492.

The previous prime is 1611217. The next prime is 1611223. The reversal of 1611221 is 1221161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1611221 - 2² = 1611217 is a prime.

It is a super-2 number, since 2×1611221² = 5192066221682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1611196 and 1611205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1611223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71 + ... + 1796.

It is an arithmetic number, because the mean of its divisors is an integer number (403488).

2^1611221 is an apocalyptic number.

It is an amenable number.

1611221 is a deficient number, since it is larger than the sum of its proper divisors (2731).

1611221 is an equidigital number, since it uses as much as digits as its factorization.

1611221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730.

The product of its digits is 24, while the sum is 14.

The square root of 1611221 is about 1269.3388042599. The cubic root of 1611221 is about 117.2334928563.

Adding to 1611221 its reverse (1221161), we get a palindrome (2832382).

The spelling of 1611221 in words is "one million, six hundred eleven thousand, two hundred twenty-one".