85144799 has 2 divisors, whose sum is σ = 85144800. Its totient is φ = 85144798.

The previous prime is 85144769. The next prime is 85144811. The reversal of 85144799 is 99744158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85144799 - 2¹⁶ = 85079263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85144769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42572399 + 42572400.

It is an arithmetic number, because the mean of its divisors is an integer number (42572400).

Almost surely, 2^85144799 is an apocalyptic number.

85144799 is a deficient number, since it is larger than the sum of its proper divisors (1).

85144799 is an equidigital number, since it uses as much as digits as its factorization.

85144799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 85144799 is about 9227.3939441210. The cubic root of 85144799 is about 439.9324948091.

The spelling of 85144799 in words is "eighty-five million, one hundred forty-four thousand, seven hundred ninety-nine".