85051979 has 4 divisors (see below), whose sum is σ = 87029976. Its totient is φ = 83073984.

The previous prime is 85051973. The next prime is 85051987. The reversal of 85051979 is 97915058.

It is a happy number.

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 85051979 - 2⁴ = 85051963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85051973) 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, 988934 + ... + 989019.

It is an arithmetic number, because the mean of its divisors is an integer number (21757494).

Almost surely, 2^85051979 is an apocalyptic number.

85051979 is a deficient number, since it is larger than the sum of its proper divisors (1977997).

85051979 is a wasteful number, since it uses less digits than its factorization.

85051979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977996.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 85051979 is about 9222.3629835308. The cubic root of 85051979 is about 439.7725735842.

The spelling of 85051979 in words is "eighty-five million, fifty-one thousand, nine hundred seventy-nine".