85538921 has 4 divisors (see below), whose sum is σ = 92118852. Its totient is φ = 78958992.

The previous prime is 85538899. The next prime is 85538927. The reversal of 85538921 is 12983558.

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 16000000 + 69538921 = 4000^2 + 8339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85538921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85538927) 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, 3289946 + ... + 3289971.

It is an arithmetic number, because the mean of its divisors is an integer number (23029713).

Almost surely, 2^85538921 is an apocalyptic number.

It is an amenable number.

85538921 is a deficient number, since it is larger than the sum of its proper divisors (6579931).

85538921 is a wasteful number, since it uses less digits than its factorization.

85538921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6579930.

The product of its digits is 86400, while the sum is 41.

The square root of 85538921 is about 9248.7253716391. The cubic root of 85538921 is about 440.6102431287.

The spelling of 85538921 in words is "eighty-five million, five hundred thirty-eight thousand, nine hundred twenty-one".