85131647 has 4 divisors (see below), whose sum is σ = 89612280. Its totient is φ = 80651016.

The previous prime is 85131643. The next prime is 85131653. The reversal of 85131647 is 74613158.

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 85131647 - 2² = 85131643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85131643) 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, 2240288 + ... + 2240325.

It is an arithmetic number, because the mean of its divisors is an integer number (22403070).

Almost surely, 2^85131647 is an apocalyptic number.

85131647 is a deficient number, since it is larger than the sum of its proper divisors (4480633).

85131647 is a wasteful number, since it uses less digits than its factorization.

85131647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4480632.

The product of its digits is 20160, while the sum is 35.

The square root of 85131647 is about 9226.6812560097. The cubic root of 85131647 is about 439.9098420647.

The spelling of 85131647 in words is "eighty-five million, one hundred thirty-one thousand, six hundred forty-seven".