85651231 has 4 divisors (see below), whose sum is σ = 85897000. Its totient is φ = 85405464.

The previous prime is 85651217. The next prime is 85651261. The reversal of 85651231 is 13215658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13215658 = 2 ⋅6607829.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85651231 is a prime.

It is a super-2 number, since 2×85651231² = 14672266743630722, 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 = 85651193 and 85651202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85651201) 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, 122361 + ... + 123058.

It is an arithmetic number, because the mean of its divisors is an integer number (21474250).

Almost surely, 2^85651231 is an apocalyptic number.

85651231 is a deficient number, since it is larger than the sum of its proper divisors (245769).

85651231 is a wasteful number, since it uses less digits than its factorization.

85651231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245768.

The product of its digits is 7200, while the sum is 31.

The square root of 85651231 is about 9254.7950274439. The cubic root of 85651231 is about 440.8029947409.

Adding to 85651231 its reverse (13215658), we get a palindrome (98866889).

The spelling of 85651231 in words is "eighty-five million, six hundred fifty-one thousand, two hundred thirty-one".