85579939 has 2 divisors, whose sum is σ = 85579940. Its totient is φ = 85579938.

The previous prime is 85579909. The next prime is 85579943. The reversal of 85579939 is 93997558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85579939 - 2¹³ = 85571747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85579939.

It is not a weakly prime, because it can be changed into another prime (85579909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42789969 + 42789970.

It is an arithmetic number, because the mean of its divisors is an integer number (42789970).

Almost surely, 2^85579939 is an apocalyptic number.

85579939 is a deficient number, since it is larger than the sum of its proper divisors (1).

85579939 is an equidigital number, since it uses as much as digits as its factorization.

85579939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3061800, while the sum is 55.

The square root of 85579939 is about 9250.9426006218. The cubic root of 85579939 is about 440.6806596623.

It can be divided in two parts, 8557 and 9939, that added together give a square (18496 = 136²).

The spelling of 85579939 in words is "eighty-five million, five hundred seventy-nine thousand, nine hundred thirty-nine".