85791321 has 48 divisors (see below), whose sum is σ = 158146560. Its totient is φ = 43515360.

The previous prime is 85791317. The next prime is 85791331. The reversal of 85791321 is 12319758.

It is not a de Polignac number, because 85791321 - 2² = 85791317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85791331) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28360 + ... + 31238.

It is an arithmetic number, because the mean of its divisors is an integer number (3294720).

Almost surely, 2^85791321 is an apocalyptic number.

It is an amenable number.

85791321 is a deficient number, since it is larger than the sum of its proper divisors (72355239).

85791321 is a wasteful number, since it uses less digits than its factorization.

85791321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2946 (or 2943 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 85791321 is about 9262.3604442928. The cubic root of 85791321 is about 441.0431876504.

The spelling of 85791321 in words is "eighty-five million, seven hundred ninety-one thousand, three hundred twenty-one".