1871364421 has 2 divisors, whose sum is σ = 1871364422. Its totient is φ = 1871364420.

The previous prime is 1871364401. The next prime is 1871364491. The reversal of 1871364421 is 1244631781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1144468900 + 726895521 = 33830^2 + 26961^2 .

It is an emirp because it is prime and its reverse (1244631781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1871364421 - 2⁵ = 1871364389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1871364401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 935682210 + 935682211.

It is an arithmetic number, because the mean of its divisors is an integer number (935682211).

Almost surely, 2^1871364421 is an apocalyptic number.

It is an amenable number.

1871364421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1871364421 is an equidigital number, since it uses as much as digits as its factorization.

1871364421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 1871364421 is about 43259.2697696112. The cubic root of 1871364421 is about 1232.3085340453.

The spelling of 1871364421 in words is "one billion, eight hundred seventy-one million, three hundred sixty-four thousand, four hundred twenty-one".