126129 has 4 divisors (see below), whose sum is σ = 168176. Its totient is φ = 84084.

The previous prime is 126127. The next prime is 126131. The reversal of 126129 is 921621.

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 an interprime number because it is at equal distance from previous prime (126127) and next prime (126131).

It is not a de Polignac number, because 126129 - 2¹ = 126127 is a prime.

It is a super-3 number, since 3×126129³ = 6019578913334067, which contains 333 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126127) 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, 21019 + ... + 21024.

It is an arithmetic number, because the mean of its divisors is an integer number (42044).

2¹²⁶¹²⁹ is an apocalyptic number.

It is an amenable number.

126129 is a deficient number, since it is larger than the sum of its proper divisors (42047).

126129 is an equidigital number, since it uses as much as digits as its factorization.

126129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42046.

The product of its digits is 216, while the sum is 21.

The square root of 126129 is about 355.1464486659. The cubic root of 126129 is about 50.1500823881.

It can be divided in two parts, 12612 and 9, that added together give a palindrome (12621).

The spelling of 126129 in words is "one hundred twenty-six thousand, one hundred twenty-nine".