2661215 has 16 divisors (see below), whose sum is σ = 3388608. Its totient is φ = 2002176.

The previous prime is 2661199. The next prime is 2661221. The reversal of 2661215 is 5121662.

It is a cyclic number.

It is not a de Polignac number, because 2661215 - 2⁴ = 2661199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8237 + ... + 8553.

It is an arithmetic number, because the mean of its divisors is an integer number (211788).

2^2661215 is an apocalyptic number.

2661215 is a deficient number, since it is larger than the sum of its proper divisors (727393).

2661215 is a wasteful number, since it uses less digits than its factorization.

2661215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418.

The product of its digits is 720, while the sum is 23.

The square root of 2661215 is about 1631.3230826541. The cubic root of 2661215 is about 138.5776910358.

Adding to 2661215 its reverse (5121662), we get a palindrome (7782877).

The spelling of 2661215 in words is "two million, six hundred sixty-one thousand, two hundred fifteen".