85525421 has 4 divisors (see below), whose sum is σ = 86324832. Its totient is φ = 84726012.

The previous prime is 85525399. The next prime is 85525439. The reversal of 85525421 is 12452558.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12452558 = 2 ⋅6226279.

It is a cyclic number.

It is not a de Polignac number, because 85525421 - 2²⁶ = 18416557 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 (85525471) 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, 399545 + ... + 399758.

It is an arithmetic number, because the mean of its divisors is an integer number (21581208).

Almost surely, 2^85525421 is an apocalyptic number.

It is an amenable number.

85525421 is a deficient number, since it is larger than the sum of its proper divisors (799411).

85525421 is a wasteful number, since it uses less digits than its factorization.

85525421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799410.

The product of its digits is 16000, while the sum is 32.

The square root of 85525421 is about 9247.9955125422. The cubic root of 85525421 is about 440.5870624480.

Adding to 85525421 its reverse (12452558), we get a palindrome (97977979).

The spelling of 85525421 in words is "eighty-five million, five hundred twenty-five thousand, four hundred twenty-one".