85256621 has 4 divisors (see below), whose sum is σ = 87560892. Its totient is φ = 82952352.

The previous prime is 85256617. The next prime is 85256651. The reversal of 85256621 is 12665258.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12665258 = 2 ⋅6332629.

It can be written as a sum of positive squares in 2 ways, for example, as 49984900 + 35271721 = 7070^2 + 5939^2 .

It is a cyclic number.

It is not a de Polignac number, because 85256621 - 2² = 85256617 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 (85256651) 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, 1152080 + ... + 1152153.

It is an arithmetic number, because the mean of its divisors is an integer number (21890223).

Almost surely, 2^85256621 is an apocalyptic number.

It is an amenable number.

85256621 is a deficient number, since it is larger than the sum of its proper divisors (2304271).

85256621 is a wasteful number, since it uses less digits than its factorization.

85256621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304270.

The product of its digits is 28800, while the sum is 35.

The square root of 85256621 is about 9233.4511966003. The cubic root of 85256621 is about 440.1250006419.

The spelling of 85256621 in words is "eighty-five million, two hundred fifty-six thousand, six hundred twenty-one".