85181439 has 16 divisors (see below), whose sum is σ = 134277120. Its totient is φ = 46996320.

The previous prime is 85181431. The next prime is 85181501. The reversal of 85181439 is 93418158.

It is not a de Polignac number, because 85181439 - 2³ = 85181431 is a prime.

It is a super-2 number, since 2×85181439² = 14511755100221442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85181397 and 85181406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85181431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69327 + ... + 70544.

It is an arithmetic number, because the mean of its divisors is an integer number (8392320).

Almost surely, 2^85181439 is an apocalyptic number.

85181439 is a deficient number, since it is larger than the sum of its proper divisors (49095681).

85181439 is a wasteful number, since it uses less digits than its factorization.

85181439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139910.

The product of its digits is 34560, while the sum is 39.

The square root of 85181439 is about 9229.3791232130. The cubic root of 85181439 is about 439.9955905205.

The spelling of 85181439 in words is "eighty-five million, one hundred eighty-one thousand, four hundred thirty-nine".