852491891 has 2 divisors, whose sum is σ = 852491892. Its totient is φ = 852491890.

The previous prime is 852491881. The next prime is 852491957. The reversal of 852491891 is 198194258.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-852491891 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (852491821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426245945 + 426245946.

It is an arithmetic number, because the mean of its divisors is an integer number (426245946).

Almost surely, 2^852491891 is an apocalyptic number.

852491891 is a deficient number, since it is larger than the sum of its proper divisors (1).

852491891 is an equidigital number, since it uses as much as digits as its factorization.

852491891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 852491891 is about 29197.4637768420. The cubic root of 852491891 is about 948.1930161058.

The spelling of 852491891 in words is "eight hundred fifty-two million, four hundred ninety-one thousand, eight hundred ninety-one".