1209438556201 has 4 divisors (see below), whose sum is σ = 1209462741504. Its totient is φ = 1209414370900.

The previous prime is 1209438556121. The next prime is 1209438556237. The reversal of 1209438556201 is 1026558349021.

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 a cyclic number.

It is not a de Polignac number, because 1209438556201 - 2¹¹ = 1209438554153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209438551201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12017485 + ... + 12117706.

It is an arithmetic number, because the mean of its divisors is an integer number (302365685376).

Almost surely, 2^{1209438556201} is an apocalyptic number.

It is an amenable number.

1209438556201 is a deficient number, since it is larger than the sum of its proper divisors (24185303).

1209438556201 is an equidigital number, since it uses as much as digits as its factorization.

1209438556201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24185302.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 1209438556201 in words is "one trillion, two hundred nine billion, four hundred thirty-eight million, five hundred fifty-six thousand, two hundred one".