86139129 has 4 divisors (see below), whose sum is σ = 114852176. Its totient is φ = 57426084.

The previous prime is 86139121. The next prime is 86139223. The reversal of 86139129 is 92193168.

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 not a de Polignac number, because 86139129 - 2³ = 86139121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86139121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14356519 + ... + 14356524.

It is an arithmetic number, because the mean of its divisors is an integer number (28713044).

Almost surely, 2^86139129 is an apocalyptic number.

It is an amenable number.

86139129 is a deficient number, since it is larger than the sum of its proper divisors (28713047).

86139129 is a wasteful number, since it uses less digits than its factorization.

86139129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28713046.

The product of its digits is 23328, while the sum is 39.

The square root of 86139129 is about 9281.1167970239. The cubic root of 86139129 is about 441.6383974945.

It can be divided in two parts, 86139 and 129, that added together give a palindrome (86268).

The spelling of 86139129 in words is "eighty-six million, one hundred thirty-nine thousand, one hundred twenty-nine".