86178121 has 4 divisors (see below), whose sum is σ = 86983632. Its totient is φ = 85372612.

The previous prime is 86178107. The next prime is 86178133. The reversal of 86178121 is 12187168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86178121 - 2¹¹ = 86176073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86178181) 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, 402595 + ... + 402808.

It is an arithmetic number, because the mean of its divisors is an integer number (21745908).

Almost surely, 2^86178121 is an apocalyptic number.

It is an amenable number.

86178121 is a deficient number, since it is larger than the sum of its proper divisors (805511).

86178121 is a wasteful number, since it uses less digits than its factorization.

86178121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805510.

The product of its digits is 5376, while the sum is 34.

The square root of 86178121 is about 9283.2171686329. The cubic root of 86178121 is about 441.7050252354.

The spelling of 86178121 in words is "eighty-six million, one hundred seventy-eight thousand, one hundred twenty-one".