85811231 has 8 divisors (see below), whose sum is σ = 94472400. Its totient is φ = 77293440.

The previous prime is 85811213. The next prime is 85811267. The reversal of 85811231 is 13211858.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85811231 is a prime.

It is a super-2 number, since 2×85811231² = 14727134731470722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85811194 and 85811203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85816231) 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 7 ways as a sum of consecutive naturals, for example, 34586 + ... + 36983.

It is an arithmetic number, because the mean of its divisors is an integer number (11809050).

Almost surely, 2^85811231 is an apocalyptic number.

85811231 is a deficient number, since it is larger than the sum of its proper divisors (8661169).

85811231 is a wasteful number, since it uses less digits than its factorization.

85811231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71689.

The product of its digits is 1920, while the sum is 29.

The square root of 85811231 is about 9263.4351619688. The cubic root of 85811231 is about 441.0773033416.

The spelling of 85811231 in words is "eighty-five million, eight hundred eleven thousand, two hundred thirty-one".