85444431 has 16 divisors (see below), whose sum is σ = 121248000. Its totient is φ = 53336448.

The previous prime is 85444421. The next prime is 85444441. The reversal of 85444431 is 13444458.

It is an interprime number because it is at equal distance from previous prime (85444421) and next prime (85444441).

It is not a de Polignac number, because 85444431 - 2¹⁷ = 85313359 is a prime.

It is a super-2 number, since 2×85444431² = 14601501577827522, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 85444392 and 85444401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85444421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5940 + ... + 14358.

It is an arithmetic number, because the mean of its divisors is an integer number (7578000).

Almost surely, 2^85444431 is an apocalyptic number.

85444431 is a deficient number, since it is larger than the sum of its proper divisors (35803569).

85444431 is a wasteful number, since it uses less digits than its factorization.

85444431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8638.

The product of its digits is 30720, while the sum is 33.

The square root of 85444431 is about 9243.6156886794. The cubic root of 85444431 is about 440.4479442953.

Adding to 85444431 its reverse (13444458), we get a palindrome (98888889).

The spelling of 85444431 in words is "eighty-five million, four hundred forty-four thousand, four hundred thirty-one".