1206129 has 4 divisors (see below), whose sum is σ = 1608176. Its totient is φ = 804084.

The previous prime is 1206113. The next prime is 1206131. The reversal of 1206129 is 9216021.

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 1206129 - 2⁴ = 1206113 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1206169) 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 3 ways as a sum of consecutive naturals, for example, 201019 + ... + 201024.

It is an arithmetic number, because the mean of its divisors is an integer number (402044).

2^1206129 is an apocalyptic number.

It is an amenable number.

1206129 is a deficient number, since it is larger than the sum of its proper divisors (402047).

1206129 is an equidigital number, since it uses as much as digits as its factorization.

1206129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402046.

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

The square root of 1206129 is about 1098.2390450171. The cubic root of 1206129 is about 106.4464673984.

It can be divided in two parts, 12061 and 29, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 1206129 in words is "one million, two hundred six thousand, one hundred twenty-nine".