85144719389 has 2 divisors, whose sum is σ = 85144719390. Its totient is φ = 85144719388.

The previous prime is 85144719313. The next prime is 85144719391. The reversal of 85144719389 is 98391744158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71283660100 + 13861059289 = 266990^2 + 117733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85144719389 is a prime.

Together with 85144719391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85144719089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42572359694 + 42572359695.

It is an arithmetic number, because the mean of its divisors is an integer number (42572359695).

Almost surely, 2^85144719389 is an apocalyptic number.

It is an amenable number.

85144719389 is a deficient number, since it is larger than the sum of its proper divisors (1).

85144719389 is an equidigital number, since it uses as much as digits as its factorization.

85144719389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 59.

The spelling of 85144719389 in words is "eighty-five billion, one hundred forty-four million, seven hundred nineteen thousand, three hundred eighty-nine".