85523831 has 4 divisors (see below), whose sum is σ = 86728464. Its totient is φ = 84319200.

The previous prime is 85523803. The next prime is 85523843. The reversal of 85523831 is 13832558.

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 85523831 - 2¹⁴ = 85507447 is a prime.

It is a super-2 number, since 2×85523831² = 14628651337833122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85523791 and 85523800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85523881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602210 + ... + 602351.

It is an arithmetic number, because the mean of its divisors is an integer number (21682116).

Almost surely, 2^85523831 is an apocalyptic number.

85523831 is a deficient number, since it is larger than the sum of its proper divisors (1204633).

85523831 is a wasteful number, since it uses less digits than its factorization.

85523831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204632.

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

The square root of 85523831 is about 9247.9095475680. The cubic root of 85523831 is about 440.5843321184.

The spelling of 85523831 in words is "eighty-five million, five hundred twenty-three thousand, eight hundred thirty-one".