85870521 has 24 divisors (see below), whose sum is σ = 135794880. Its totient is φ = 51856800.

The previous prime is 85870517. The next prime is 85870531. The reversal of 85870521 is 12507858.

It is not a de Polignac number, because 85870521 - 2² = 85870517 is a prime.

It is a super-2 number, since 2×85870521² = 14747492753622882, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (85870501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29395 + ... + 32183.

It is an arithmetic number, because the mean of its divisors is an integer number (5658120).

Almost surely, 2^85870521 is an apocalyptic number.

It is an amenable number.

85870521 is a deficient number, since it is larger than the sum of its proper divisors (49924359).

85870521 is a wasteful number, since it uses less digits than its factorization.

85870521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117 (or 3114 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 85870521 is about 9266.6348260844. The cubic root of 85870521 is about 441.1788652325.

The spelling of 85870521 in words is "eighty-five million, eight hundred seventy thousand, five hundred twenty-one".