3781221803 has 2 divisors, whose sum is σ = 3781221804. Its totient is φ = 3781221802.

The previous prime is 3781221799. The next prime is 3781221833. The reversal of 3781221803 is 3081221873.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3781221803 - 2² = 3781221799 is a prime.

It is not a weakly prime, because it can be changed into another prime (3781221833) 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 as a sum of consecutive naturals, namely, 1890610901 + 1890610902.

It is an arithmetic number, because the mean of its divisors is an integer number (1890610902).

Almost surely, 2^3781221803 is an apocalyptic number.

3781221803 is a deficient number, since it is larger than the sum of its proper divisors (1).

3781221803 is an equidigital number, since it uses as much as digits as its factorization.

3781221803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 3781221803 is about 61491.6401066031. The cubic root of 3781221803 is about 1557.9160485832.

The spelling of 3781221803 in words is "three billion, seven hundred eighty-one million, two hundred twenty-one thousand, eight hundred three".