1850445221 has 4 divisors (see below), whose sum is σ = 1900457292. Its totient is φ = 1800433152.

The previous prime is 1850445217. The next prime is 1850445227. The reversal of 1850445221 is 1225440581.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1259469121 + 590976100 = 35489^2 + 24310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1850445221 - 2² = 1850445217 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 (1850445227) 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, 25005980 + ... + 25006053.

It is an arithmetic number, because the mean of its divisors is an integer number (475114323).

Almost surely, 2^1850445221 is an apocalyptic number.

It is an amenable number.

1850445221 is a deficient number, since it is larger than the sum of its proper divisors (50012071).

1850445221 is an equidigital number, since it uses as much as digits as its factorization.

1850445221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50012070.

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 1850445221 is about 43016.8016128582. The cubic root of 1850445221 is about 1227.6994964476.

The spelling of 1850445221 in words is "one billion, eight hundred fifty million, four hundred forty-five thousand, two hundred twenty-one".