85191679 has 2 divisors, whose sum is σ = 85191680. Its totient is φ = 85191678.

The previous prime is 85191661. The next prime is 85191707. The reversal of 85191679 is 97619158.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85191679 - 2⁹ = 85191167 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85191979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42595839 + 42595840.

It is an arithmetic number, because the mean of its divisors is an integer number (42595840).

Almost surely, 2^85191679 is an apocalyptic number.

85191679 is a deficient number, since it is larger than the sum of its proper divisors (1).

85191679 is an equidigital number, since it uses as much as digits as its factorization.

85191679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The square root of 85191679 is about 9229.9338567511. The cubic root of 85191679 is about 440.0132210215.

The spelling of 85191679 in words is "eighty-five million, one hundred ninety-one thousand, six hundred seventy-nine".