985163831 has 4 divisors (see below), whose sum is σ = 987987000. Its totient is φ = 982340664.

The previous prime is 985163827. The next prime is 985163833. The reversal of 985163831 is 138361589.

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 985163831 - 2² = 985163827 is a prime.

It is a super-2 number, since 2×985163831² = 1941095547821193122, 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 (985163833) 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, 1411061 + ... + 1411758.

It is an arithmetic number, because the mean of its divisors is an integer number (246996750).

Almost surely, 2^985163831 is an apocalyptic number.

985163831 is a deficient number, since it is larger than the sum of its proper divisors (2823169).

985163831 is a wasteful number, since it uses less digits than its factorization.

985163831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823168.

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

The square root of 985163831 is about 31387.3195892864. The cubic root of 985163831 is about 995.0299498573.

The spelling of 985163831 in words is "nine hundred eighty-five million, one hundred sixty-three thousand, eight hundred thirty-one".