2187851 has 2 divisors, whose sum is σ = 2187852. Its totient is φ = 2187850.

The previous prime is 2187833. The next prime is 2187863. The reversal of 2187851 is 1587812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2187851 - 2¹⁰ = 2186827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2187811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093925 + 1093926.

It is an arithmetic number, because the mean of its divisors is an integer number (1093926).

2^2187851 is an apocalyptic number.

2187851 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187851 is an equidigital number, since it uses as much as digits as its factorization.

2187851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 32.

The square root of 2187851 is about 1479.1386006727. The cubic root of 2187851 is about 129.8192952814.

The spelling of 2187851 in words is "two million, one hundred eighty-seven thousand, eight hundred fifty-one".