2185551 has 12 divisors (see below), whose sum is σ = 3323320. Its totient is φ = 1380240.

The previous prime is 2185541. The next prime is 2185567. The reversal of 2185551 is 1555812.

2185551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2185551 - 2¹⁵ = 2152783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185511) 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 11 ways as a sum of consecutive naturals, for example, 6220 + ... + 6561.

2^2185551 is an apocalyptic number.

2185551 is a deficient number, since it is larger than the sum of its proper divisors (1137769).

2185551 is a wasteful number, since it uses less digits than its factorization.

2185551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12806 (or 12803 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The square root of 2185551 is about 1478.3609166912. The cubic root of 2185551 is about 129.7737880583.

The spelling of 2185551 in words is "two million, one hundred eighty-five thousand, five hundred fifty-one".