1872842891 has 2 divisors, whose sum is σ = 1872842892. Its totient is φ = 1872842890.

The previous prime is 1872842869. The next prime is 1872842911. The reversal of 1872842891 is 1982482781.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1872842891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1872842861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936421445 + 936421446.

It is an arithmetic number, because the mean of its divisors is an integer number (936421446).

Almost surely, 2^1872842891 is an apocalyptic number.

1872842891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872842891 is an equidigital number, since it uses as much as digits as its factorization.

1872842891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 50.

The square root of 1872842891 is about 43276.3548719159. The cubic root of 1872842891 is about 1232.6329767502.

The spelling of 1872842891 in words is "one billion, eight hundred seventy-two million, eight hundred forty-two thousand, eight hundred ninety-one".