139129 has 3 divisors (see below), whose sum is σ = 139503. Its totient is φ = 138756.
The previous prime is 139123. The next prime is 139133. The reversal of 139129 is 921931.
The square root of 139129 is 373.
It is a perfect power (a square), and thus also a powerful number.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It can be written as a sum of positive squares in only one way, i.e., 75625 + 63504 = 275^2 + 252^2 .
It is not a de Polignac number, because 139129 - 23 = 139121 is a prime.
It is a pancake number, because a pancake can be divided into 139129 parts by 527 straight cuts.
It is a Duffinian number.
It is a plaindrome in base 14.
It is not an unprimeable number, because it can be changed into a prime (139121) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 187 + ... + 559.
It is an arithmetic number, because the mean of its divisors is an integer number (46501).
139129 is a Friedman number, since it can be written as (9+91*(3+1))^2, using all its digits and the basic arithmetic operations.
2139129 is an apocalyptic number.
139129 is the 373-rd square number.
139129 is the 187-th centered octagonal number.
It is an amenable number.
139129 is a deficient number, since it is larger than the sum of its proper divisors (374).
139129 is an frugal number, since it uses more digits than its factorization.
139129 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 746 (or 373 counting only the distinct ones).
The product of its digits is 486, while the sum is 25.
The cubic root of 139129 is about 51.8170344934.
Multiplying 139129 by its sum of digits (25), we get a square (3478225 = 18652).
The spelling of 139129 in words is "one hundred thirty-nine thousand, one hundred twenty-nine".
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