85191812 has 6 divisors (see below), whose sum is σ = 149085678. Its totient is φ = 42595904.

The previous prime is 85191791. The next prime is 85191823. The reversal of 85191812 is 21819158.

It can be written as a sum of positive squares in only one way, i.e., 50922496 + 34269316 = 7136^2 + 5854^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10648973 + ... + 10648980.

It is an arithmetic number, because the mean of its divisors is an integer number (24847613).

Almost surely, 2^85191812 is an apocalyptic number.

It is an amenable number.

85191812 is a deficient number, since it is larger than the sum of its proper divisors (63893866).

85191812 is a wasteful number, since it uses less digits than its factorization.

85191812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21297957 (or 21297955 counting only the distinct ones).

The product of its digits is 5760, while the sum is 35.

The square root of 85191812 is about 9229.9410615670. The cubic root of 85191812 is about 440.0134500021.

The spelling of 85191812 in words is "eighty-five million, one hundred ninety-one thousand, eight hundred twelve".