85128131 has 8 divisors (see below), whose sum is σ = 93163824. Its totient is φ = 77141920.

The previous prime is 85128119. The next prime is 85128133. The reversal of 85128131 is 13182158.

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

It is a cyclic number.

It is not a de Polignac number, because 85128131 - 2⁶ = 85128067 is a prime.

It is a super-2 number, since 2×85128131² = 14493597375106322, 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 = 85128094 and 85128103.

It is not an unprimeable number, because it can be changed into a prime (85128133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8720 + ... + 15693.

It is an arithmetic number, because the mean of its divisors is an integer number (11645478).

Almost surely, 2^85128131 is an apocalyptic number.

85128131 is a deficient number, since it is larger than the sum of its proper divisors (8035693).

85128131 is a wasteful number, since it uses less digits than its factorization.

85128131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24741.

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

The square root of 85128131 is about 9226.4907196615. The cubic root of 85128131 is about 439.9037857807.

It can be divided in two parts, 851 and 28131, that added together give a palindrome (28982).

The spelling of 85128131 in words is "eighty-five million, one hundred twenty-eight thousand, one hundred thirty-one".