220001851 has 4 divisors (see below), whose sum is σ = 221273712. Its totient is φ = 218729992.

The previous prime is 220001849. The next prime is 220001857. The reversal of 220001851 is 158100022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220001851 - 2¹ = 220001849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220001857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635671 + ... + 636016.

It is an arithmetic number, because the mean of its divisors is an integer number (55318428).

Almost surely, 2^220001851 is an apocalyptic number.

220001851 is a deficient number, since it is larger than the sum of its proper divisors (1271861).

220001851 is a wasteful number, since it uses less digits than its factorization.

220001851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271860.

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

The square root of 220001851 is about 14832.4593712574. The cubic root of 220001851 is about 603.6827667260.

Adding to 220001851 its reverse (158100022), we get a palindrome (378101873).

The spelling of 220001851 in words is "two hundred twenty million, one thousand, eight hundred fifty-one".