1212129 has 6 divisors (see below), whose sum is σ = 1750866. Its totient is φ = 808080.

The previous prime is 1212121. The next prime is 1212149. The reversal of 1212129 is 9212121.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 603729 = 780^2 + 777^2 .

It is not a de Polignac number, because 1212129 - 2³ = 1212121 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67332 + ... + 67349.

It is an arithmetic number, because the mean of its divisors is an integer number (291811).

2^1212129 is an apocalyptic number.

It is an amenable number.

1212129 is a deficient number, since it is larger than the sum of its proper divisors (538737).

1212129 is a wasteful number, since it uses less digits than its factorization.

1212129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134687 (or 134684 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1212129 is about 1100.9673019668. The cubic root of 1212129 is about 106.6226847754.

Adding to 1212129 its product of digits (72), we get a square (1212201 = 1101²).

The spelling of 1212129 in words is "one million, two hundred twelve thousand, one hundred twenty-nine".