85181865 has 32 divisors (see below), whose sum is σ = 140279040. Its totient is φ = 44119296.

The previous prime is 85181861. The next prime is 85181869. The reversal of 85181865 is 56818158.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (85181861) and next prime (85181869).

It is not a de Polignac number, because 85181865 - 2² = 85181861 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85181861) 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 in 31 ways as a sum of consecutive naturals, for example, 86164 + ... + 87146.

It is an arithmetic number, because the mean of its divisors is an integer number (4383720).

Almost surely, 2^85181865 is an apocalyptic number.

It is an amenable number.

85181865 is a deficient number, since it is larger than the sum of its proper divisors (55097175).

85181865 is a wasteful number, since it uses less digits than its factorization.

85181865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153.

The product of its digits is 76800, while the sum is 42.

The square root of 85181865 is about 9229.4022016597. The cubic root of 85181865 is about 439.9963240051.

The spelling of 85181865 in words is "eighty-five million, one hundred eighty-one thousand, eight hundred sixty-five".