85144469 has 2 divisors, whose sum is σ = 85144470. Its totient is φ = 85144468.

The previous prime is 85144463. The next prime is 85144487. The reversal of 85144469 is 96444158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83356900 + 1787569 = 9130^2 + 1337^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85144469 is a prime.

It is a super-2 number, since 2×85144469² = 14499161202583922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85144463) 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, 42572234 + 42572235.

It is an arithmetic number, because the mean of its divisors is an integer number (42572235).

Almost surely, 2^85144469 is an apocalyptic number.

It is an amenable number.

85144469 is a deficient number, since it is larger than the sum of its proper divisors (1).

85144469 is an equidigital number, since it uses as much as digits as its factorization.

85144469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The square root of 85144469 is about 9227.3760625651. The cubic root of 85144469 is about 439.9319264522.

The spelling of 85144469 in words is "eighty-five million, one hundred forty-four thousand, four hundred sixty-nine".