3221505 has 48 divisors (see below), whose sum is σ = 6675840. Its totient is φ = 1469664.

The previous prime is 3221503. The next prime is 3221509. The reversal of 3221505 is 5051223.

It is a happy number.

It is not a de Polignac number, because 3221505 - 2¹ = 3221503 is a prime.

It is a Curzon number.

3221505 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3221501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6372 + ... + 6858.

It is an arithmetic number, because the mean of its divisors is an integer number (139080).

It is a Proth number, since it is equal to 1573 ⋅ 2¹¹ + 1 and 1573 < 2¹¹.

Almost surely, 2^3221505 is an apocalyptic number.

3221505 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3221505 is an abundant number, since it is smaller than the sum of its proper divisors (3454335).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3221505 is a wasteful number, since it uses less digits than its factorization.

3221505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 3221505 is about 1794.8551473587. The cubic root of 3221505 is about 147.6906277979.

Adding to 3221505 its reverse (5051223), we get a palindrome (8272728).

The spelling of 3221505 in words is "three million, two hundred twenty-one thousand, five hundred five".