85079981 has 8 divisors (see below), whose sum is σ = 97396800. Its totient is φ = 72803808.

The previous prime is 85079977. The next prime is 85079993. The reversal of 85079981 is 18997058.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85079981 - 2² = 85079977 is a prime.

It is a super-2 number, since 2×85079981² = 14477206333920722, 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 (85079941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5531 + ... + 14168.

It is an arithmetic number, because the mean of its divisors is an integer number (12174600).

Almost surely, 2^85079981 is an apocalyptic number.

It is an amenable number.

85079981 is a deficient number, since it is larger than the sum of its proper divisors (12316819).

85079981 is a wasteful number, since it uses less digits than its factorization.

85079981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20323.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 85079981 is about 9223.8810161450. The cubic root of 85079981 is about 439.8208309775.

The spelling of 85079981 in words is "eighty-five million, seventy-nine thousand, nine hundred eighty-one".