86849891 has 2 divisors, whose sum is σ = 86849892. Its totient is φ = 86849890.

The previous prime is 86849869. The next prime is 86849897. The reversal of 86849891 is 19894868.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86849891 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (86849897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43424945 + 43424946.

It is an arithmetic number, because the mean of its divisors is an integer number (43424946).

Almost surely, 2^86849891 is an apocalyptic number.

86849891 is a deficient number, since it is larger than the sum of its proper divisors (1).

86849891 is an equidigital number, since it uses as much as digits as its factorization.

86849891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 53.

The square root of 86849891 is about 9319.3288921467. The cubic root of 86849891 is about 442.8497725001.

The spelling of 86849891 in words is "eighty-six million, eight hundred forty-nine thousand, eight hundred ninety-one".