85644921 has 4 divisors (see below), whose sum is σ = 114193232. Its totient is φ = 57096612.

The previous prime is 85644919. The next prime is 85644953. The reversal of 85644921 is 12944658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 85644921 - 2¹ = 85644919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85644921.

It is not an unprimeable number, because it can be changed into a prime (85644901) 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, 14274151 + ... + 14274156.

It is an arithmetic number, because the mean of its divisors is an integer number (28548308).

Almost surely, 2^85644921 is an apocalyptic number.

It is an amenable number.

85644921 is a deficient number, since it is larger than the sum of its proper divisors (28548311).

85644921 is a wasteful number, since it uses less digits than its factorization.

85644921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28548310.

The product of its digits is 69120, while the sum is 39.

The square root of 85644921 is about 9254.4541168024. The cubic root of 85644921 is about 440.7921696962.

The spelling of 85644921 in words is "eighty-five million, six hundred forty-four thousand, nine hundred twenty-one".