86542279 has 4 divisors (see below), whose sum is σ = 86854984. Its totient is φ = 86229576.

The previous prime is 86542277. The next prime is 86542301. The reversal of 86542279 is 97224568.

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 86542279 - 2¹ = 86542277 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 (86542277) 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, 155937 + ... + 156490.

It is an arithmetic number, because the mean of its divisors is an integer number (21713746).

Almost surely, 2^86542279 is an apocalyptic number.

86542279 is a deficient number, since it is larger than the sum of its proper divisors (312705).

86542279 is a wasteful number, since it uses less digits than its factorization.

86542279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312704.

The product of its digits is 241920, while the sum is 43.

The square root of 86542279 is about 9302.8102743203. The cubic root of 86542279 is about 442.3263135686.

The spelling of 86542279 in words is "eighty-six million, five hundred forty-two thousand, two hundred seventy-nine".