2221509 has 16 divisors (see below), whose sum is σ = 3212352. Its totient is φ = 1360128.

The previous prime is 2221507. The next prime is 2221511. The reversal of 2221509 is 9051222.

2221509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2221507) and next prime (2221511).

It is not a de Polignac number, because 2221509 - 2¹ = 2221507 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221507) 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 15 ways as a sum of consecutive naturals, for example, 1687 + ... + 2699.

It is an arithmetic number, because the mean of its divisors is an integer number (200772).

2^2221509 is an apocalyptic number.

It is an amenable number.

2221509 is a deficient number, since it is larger than the sum of its proper divisors (990843).

2221509 is a wasteful number, since it uses less digits than its factorization.

2221509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2221509 is about 1490.4727437964. The cubic root of 2221509 is about 130.4816256921.

The spelling of 2221509 in words is "two million, two hundred twenty-one thousand, five hundred nine".