85791421 has 8 divisors (see below), whose sum is σ = 86856704. Its totient is φ = 84732480.

The previous prime is 85791413. The next prime is 85791427. The reversal of 85791421 is 12419758.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85791421 - 2³ = 85791413 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 (85791427) 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, 29206 + ... + 32008.

It is an arithmetic number, because the mean of its divisors is an integer number (10857088).

Almost surely, 2^85791421 is an apocalyptic number.

It is an amenable number.

85791421 is a deficient number, since it is larger than the sum of its proper divisors (1065283).

85791421 is a wasteful number, since it uses less digits than its factorization.

85791421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3171.

The product of its digits is 20160, while the sum is 37.

The square root of 85791421 is about 9262.3658424832. The cubic root of 85791421 is about 441.0433590131.

It can be divided in two parts, 8579 and 1421, that added together give a 4-th power (10000 = 10⁴).

The spelling of 85791421 in words is "eighty-five million, seven hundred ninety-one thousand, four hundred twenty-one".