85422979 has 2 divisors, whose sum is σ = 85422980. Its totient is φ = 85422978.

The previous prime is 85422959. The next prime is 85423007. The reversal of 85422979 is 97922458.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85422979 is a prime.

It is not a weakly prime, because it can be changed into another prime (85422919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42711489 + 42711490.

It is an arithmetic number, because the mean of its divisors is an integer number (42711490).

Almost surely, 2^85422979 is an apocalyptic number.

85422979 is a deficient number, since it is larger than the sum of its proper divisors (1).

85422979 is an equidigital number, since it uses as much as digits as its factorization.

85422979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 85422979 is about 9242.4552473896. The cubic root of 85422979 is about 440.4110810380.

The spelling of 85422979 in words is "eighty-five million, four hundred twenty-two thousand, nine hundred seventy-nine".