986158991 has 4 divisors (see below), whose sum is σ = 993253800. Its totient is φ = 979064184.

The previous prime is 986158963. The next prime is 986159003. The reversal of 986158991 is 199851689.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199851689 = 37 ⋅5401397.

It is a cyclic number.

It is not a de Polignac number, because 986158991 - 2²⁶ = 919050127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (986158091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3547196 + ... + 3547473.

It is an arithmetic number, because the mean of its divisors is an integer number (248313450).

Almost surely, 2^986158991 is an apocalyptic number.

986158991 is a deficient number, since it is larger than the sum of its proper divisors (7094809).

986158991 is a wasteful number, since it uses less digits than its factorization.

986158991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7094808.

The product of its digits is 1399680, while the sum is 56.

The square root of 986158991 is about 31403.1684866352. The cubic root of 986158991 is about 995.3648791825.

The spelling of 986158991 in words is "nine hundred eighty-six million, one hundred fifty-eight thousand, nine hundred ninety-one".