851336891 has 2 divisors, whose sum is σ = 851336892. Its totient is φ = 851336890.

The previous prime is 851336869. The next prime is 851336917. The reversal of 851336891 is 198633158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 851336891 - 2¹⁴ = 851320507 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (851336821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425668445 + 425668446.

It is an arithmetic number, because the mean of its divisors is an integer number (425668446).

Almost surely, 2^851336891 is an apocalyptic number.

851336891 is a deficient number, since it is larger than the sum of its proper divisors (1).

851336891 is an equidigital number, since it uses as much as digits as its factorization.

851336891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 851336891 is about 29177.6779576443. The cubic root of 851336891 is about 947.7646022944.

The spelling of 851336891 in words is "eight hundred fifty-one million, three hundred thirty-six thousand, eight hundred ninety-one".