1206720233129 has 4 divisors (see below), whose sum is σ = 1206741635076. Its totient is φ = 1206698831184.

The previous prime is 1206720233101. The next prime is 1206720233153. The reversal of 1206720233129 is 9213320276021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 250627393129 + 956092840000 = 500627^2 + 977800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1206720233129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1206720233092 and 1206720233101.

It is not an unprimeable number, because it can be changed into a prime (1206720233179) 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, 10616174 + ... + 10729239.

It is an arithmetic number, because the mean of its divisors is an integer number (301685408769).

Almost surely, 2^{1206720233129} is an apocalyptic number.

It is an amenable number.

1206720233129 is a deficient number, since it is larger than the sum of its proper divisors (21401947).

1206720233129 is an equidigital number, since it uses as much as digits as its factorization.

1206720233129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21401946.

The product of its (nonzero) digits is 54432, while the sum is 38.

The spelling of 1206720233129 in words is "one trillion, two hundred six billion, seven hundred twenty million, two hundred thirty-three thousand, one hundred twenty-nine".