985197791 has 4 divisors (see below), whose sum is σ = 987326112. Its totient is φ = 983069472.

The previous prime is 985197767. The next prime is 985197797. The reversal of 985197791 is 197791589.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 985197791 - 2⁶ = 985197727 is a prime.

It is a super-2 number, since 2×985197791² = 1941229374782559362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985197797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063466 + ... + 1064391.

It is an arithmetic number, because the mean of its divisors is an integer number (246831528).

Almost surely, 2^985197791 is an apocalyptic number.

985197791 is a deficient number, since it is larger than the sum of its proper divisors (2128321).

985197791 is a wasteful number, since it uses less digits than its factorization.

985197791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128320.

The product of its digits is 1428840, while the sum is 56.

The square root of 985197791 is about 31387.8605674232. The cubic root of 985197791 is about 995.0413830923.

The spelling of 985197791 in words is "nine hundred eighty-five million, one hundred ninety-seven thousand, seven hundred ninety-one".