986719891 has 2 divisors, whose sum is σ = 986719892. Its totient is φ = 986719890.

The previous prime is 986719883. The next prime is 986719901. The reversal of 986719891 is 198917689.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 986719891 - 2³ = 986719883 is a prime.

It is a super-2 number, since 2×986719891² = 1947232286590103762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (986719841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493359945 + 493359946.

It is an arithmetic number, because the mean of its divisors is an integer number (493359946).

Almost surely, 2^986719891 is an apocalyptic number.

986719891 is a deficient number, since it is larger than the sum of its proper divisors (1).

986719891 is an equidigital number, since it uses as much as digits as its factorization.

986719891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 58.

The square root of 986719891 is about 31412.0978446203. The cubic root of 986719891 is about 995.5535554341.

The spelling of 986719891 in words is "nine hundred eighty-six million, seven hundred nineteen thousand, eight hundred ninety-one".