1213404129 has 24 divisors (see below), whose sum is σ = 2031299712. Its totient is φ = 683605440.

The previous prime is 1213404113. The next prime is 1213404133. The reversal of 1213404129 is 9214043121.

It is a happy number.

It is not a de Polignac number, because 1213404129 - 2⁴ = 1213404113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213404329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131164 + ... + 140109.

It is an arithmetic number, because the mean of its divisors is an integer number (84637488).

Almost surely, 2^1213404129 is an apocalyptic number.

It is an amenable number.

1213404129 is a deficient number, since it is larger than the sum of its proper divisors (817895583).

1213404129 is a wasteful number, since it uses less digits than its factorization.

1213404129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271357 (or 271354 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1213404129 is about 34833.9508095192. The cubic root of 1213404129 is about 1066.6005979369.

The spelling of 1213404129 in words is "one billion, two hundred thirteen million, four hundred four thousand, one hundred twenty-nine".