1874221891 has 2 divisors, whose sum is σ = 1874221892. Its totient is φ = 1874221890.

The previous prime is 1874221873. The next prime is 1874221903. The reversal of 1874221891 is 1981224781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1874221891 - 2⁵ = 1874221859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1874221871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 937110945 + 937110946.

It is an arithmetic number, because the mean of its divisors is an integer number (937110946).

Almost surely, 2^1874221891 is an apocalyptic number.

1874221891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1874221891 is an equidigital number, since it uses as much as digits as its factorization.

1874221891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 43.

The square root of 1874221891 is about 43292.2844280595. The cubic root of 1874221891 is about 1232.9354374029.

The spelling of 1874221891 in words is "one billion, eight hundred seventy-four million, two hundred twenty-one thousand, eight hundred ninety-one".