2201851 has 4 divisors (see below), whose sum is σ = 2205000. Its totient is φ = 2198704.

The previous prime is 2201839. The next prime is 2201897. The reversal of 2201851 is 1581022.

2201851 is a nontrivial binomial coefficient, being equal to C(2099, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2201851 - 2⁷ = 2201723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2201051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 2098.

It is an arithmetic number, because the mean of its divisors is an integer number (551250).

2^2201851 is an apocalyptic number.

2201851 is the 2098-th triangular number.

2201851 is the 700-th centered nonagonal number.

2201851 is a deficient number, since it is larger than the sum of its proper divisors (3149).

2201851 is a wasteful number, since it uses less digits than its factorization.

2201851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2201851 is about 1483.8635382002. The cubic root of 2201851 is about 130.0956101385.

Adding to 2201851 its reverse (1581022), we get a palindrome (3782873).

The spelling of 2201851 in words is "two million, two hundred one thousand, eight hundred fifty-one".