85181111 has 4 divisors (see below), whose sum is σ = 85247592. Its totient is φ = 85114632.

The previous prime is 85181093. The next prime is 85181113. The reversal of 85181111 is 11118158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11118158 = 2 ⋅5559079.

It is a cyclic number.

It is not a de Polignac number, because 85181111 - 2¹⁰ = 85180087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85181113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31280 + ... + 33893.

It is an arithmetic number, because the mean of its divisors is an integer number (21311898).

Almost surely, 2^85181111 is an apocalyptic number.

85181111 is a deficient number, since it is larger than the sum of its proper divisors (66481).

85181111 is a wasteful number, since it uses less digits than its factorization.

85181111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66480.

The product of its digits is 320, while the sum is 26.

The square root of 85181111 is about 9229.3613538533. The cubic root of 85181111 is about 439.9950257702.

Adding to 85181111 its reverse (11118158), we get a palindrome (96299269).

The spelling of 85181111 in words is "eighty-five million, one hundred eighty-one thousand, one hundred eleven".