85424521 has 16 divisors (see below), whose sum is σ = 107380224. Its totient is φ = 66147264.

The previous prime is 85424509. The next prime is 85424543. The reversal of 85424521 is 12542458.

It is a cyclic number.

It is not a de Polignac number, because 85424521 - 2¹¹ = 85422473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85424221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5710 + ... + 14263.

It is an arithmetic number, because the mean of its divisors is an integer number (6711264).

Almost surely, 2^85424521 is an apocalyptic number.

It is an amenable number.

85424521 is a deficient number, since it is larger than the sum of its proper divisors (21955703).

85424521 is a wasteful number, since it uses less digits than its factorization.

85424521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20040.

The product of its digits is 12800, while the sum is 31.

The square root of 85424521 is about 9242.5386664055. The cubic root of 85424521 is about 440.4137310268.

Adding to 85424521 its reverse (12542458), we get a palindrome (97966979).

The spelling of 85424521 in words is "eighty-five million, four hundred twenty-four thousand, five hundred twenty-one".