85181099 has 4 divisors (see below), whose sum is σ = 86138280. Its totient is φ = 84223920.

The previous prime is 85181093. The next prime is 85181113. The reversal of 85181099 is 99018158.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85181099 - 2²⁴ = 68403883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85181093) 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 3 ways as a sum of consecutive naturals, for example, 478457 + ... + 478634.

It is an arithmetic number, because the mean of its divisors is an integer number (21534570).

Almost surely, 2^85181099 is an apocalyptic number.

85181099 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

85181099 is a deficient number, since it is larger than the sum of its proper divisors (957181).

85181099 is an equidigital number, since it uses as much as digits as its factorization.

85181099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957180.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 85181099 is about 9229.3607037541. The cubic root of 85181099 is about 439.9950051086.

The spelling of 85181099 in words is "eighty-five million, one hundred eighty-one thousand, ninety-nine".