2215549 has 4 divisors (see below), whose sum is σ = 2532064. Its totient is φ = 1899036.

The previous prime is 2215547. The next prime is 2215561. The reversal of 2215549 is 9455122.

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 2215549 - 2¹ = 2215547 is a prime.

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 (2215541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158247 + ... + 158260.

It is an arithmetic number, because the mean of its divisors is an integer number (633016).

2^2215549 is an apocalyptic number.

It is an amenable number.

2215549 is a deficient number, since it is larger than the sum of its proper divisors (316515).

2215549 is an equidigital number, since it uses as much as digits as its factorization.

2215549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316514.

The product of its digits is 3600, while the sum is 28.

The square root of 2215549 is about 1488.4720353436. The cubic root of 2215549 is about 130.3648331593.

The spelling of 2215549 in words is "two million, two hundred fifteen thousand, five hundred forty-nine".