85945921 has 4 divisors (see below), whose sum is σ = 86080644. Its totient is φ = 85811200.

The previous prime is 85945903. The next prime is 85945927. The reversal of 85945921 is 12954958.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51265600 + 34680321 = 7160^2 + 5889^2 .

It is a cyclic number.

It is not a de Polignac number, because 85945921 - 2⁷ = 85945793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85945927) 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, 66400 + ... + 67681.

It is an arithmetic number, because the mean of its divisors is an integer number (21520161).

Almost surely, 2^85945921 is an apocalyptic number.

It is an amenable number.

85945921 is a deficient number, since it is larger than the sum of its proper divisors (134723).

85945921 is a wasteful number, since it uses less digits than its factorization.

85945921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134722.

The product of its digits is 129600, while the sum is 43.

The square root of 85945921 is about 9270.7022927068. The cubic root of 85945921 is about 441.3079555363.

The spelling of 85945921 in words is "eighty-five million, nine hundred forty-five thousand, nine hundred twenty-one".