2616221 has 2 divisors, whose sum is σ = 2616222. Its totient is φ = 2616220.

The previous prime is 2616217. The next prime is 2616241. The reversal of 2616221 is 1226162.

It is a happy number.

It is an a-pointer prime, because the next prime (2616241) can be obtained adding 2616221 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2464900 + 151321 = 1570^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2616221 - 2² = 2616217 is a prime.

It is a super-2 number, since 2×2616221² = 13689224641682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2616193 and 2616202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2616241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1308110 + 1308111.

It is an arithmetic number, because the mean of its divisors is an integer number (1308111).

2^2616221 is an apocalyptic number.

It is an amenable number.

2616221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2616221 is an equidigital number, since it uses as much as digits as its factorization.

2616221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

The square root of 2616221 is about 1617.4736473897. The cubic root of 2616221 is about 137.7922555074.

The spelling of 2616221 in words is "two million, six hundred sixteen thousand, two hundred twenty-one".