85181500 has 24 divisors (see below), whose sum is σ = 186037488. Its totient is φ = 34072400.

The previous prime is 85181431. The next prime is 85181501. The reversal of 85181500 is 518158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85181501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84682 + ... + 85681.

It is an arithmetic number, because the mean of its divisors is an integer number (7751562).

Almost surely, 2^85181500 is an apocalyptic number.

It is an amenable number.

85181500 is an abundant number, since it is smaller than the sum of its proper divisors (100855988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85181500 is a wasteful number, since it uses less digits than its factorization.

85181500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170382 (or 170370 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 28.

The square root of 85181500 is about 9229.3824278767. The cubic root of 85181500 is about 439.9956955502.

Adding to 85181500 its reverse (518158), we get a palindrome (85699658).

The spelling of 85181500 in words is "eighty-five million, one hundred eighty-one thousand, five hundred".