85776531 has 4 divisors (see below), whose sum is σ = 114368712. Its totient is φ = 57184352.

The previous prime is 85776521. The next prime is 85776539. The reversal of 85776531 is 13567758.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85776531 - 2²² = 81582227 is a prime.

It is a super-3 number, since 3×85776531³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (85776539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14296086 + ... + 14296091.

It is an arithmetic number, because the mean of its divisors is an integer number (28592178).

Almost surely, 2^85776531 is an apocalyptic number.

85776531 is a deficient number, since it is larger than the sum of its proper divisors (28592181).

85776531 is a wasteful number, since it uses less digits than its factorization.

85776531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28592180.

The product of its digits is 176400, while the sum is 42.

The square root of 85776531 is about 9261.5620172841. The cubic root of 85776531 is about 441.0178416381.

The spelling of 85776531 in words is "eighty-five million, seven hundred seventy-six thousand, five hundred thirty-one".