85118981 has 4 divisors (see below), whose sum is σ = 87419532. Its totient is φ = 82818432.

The previous prime is 85118951. The next prime is 85118987. The reversal of 85118981 is 18981158.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28793956 + 56325025 = 5366^2 + 7505^2 .

It is not a de Polignac number, because 85118981 - 2¹⁰ = 85117957 is a prime.

It is a super-2 number, since 2×85118981² = 14490481852956722, 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 (85118987) 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, 1150220 + ... + 1150293.

It is an arithmetic number, because the mean of its divisors is an integer number (21854883).

Almost surely, 2^85118981 is an apocalyptic number.

It is an amenable number.

85118981 is a deficient number, since it is larger than the sum of its proper divisors (2300551).

85118981 is a wasteful number, since it uses less digits than its factorization.

85118981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300550.

The product of its digits is 23040, while the sum is 41.

The square root of 85118981 is about 9225.9948515052. The cubic root of 85118981 is about 439.8880241916. Note that the first 3 decimals are identical.

The spelling of 85118981 in words is "eighty-five million, one hundred eighteen thousand, nine hundred eighty-one".