1213523205001 has 4 divisors (see below), whose sum is σ = 1213555726852. Its totient is φ = 1213490683152.

The previous prime is 1213523204989. The next prime is 1213523205007. The reversal of 1213523205001 is 1005023253121.

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 335883998025 + 877639206976 = 579555^2 + 936824^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213523205001 - 2²¹ = 1213521107849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213523205007) 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, 16204890 + ... + 16279603.

It is an arithmetic number, because the mean of its divisors is an integer number (303388931713).

Almost surely, 2^{1213523205001} is an apocalyptic number.

It is an amenable number.

1213523205001 is a deficient number, since it is larger than the sum of its proper divisors (32521851).

1213523205001 is an equidigital number, since it uses as much as digits as its factorization.

1213523205001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32521850.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 1213523205001 its reverse (1005023253121), we get a palindrome (2218546458122).

The spelling of 1213523205001 in words is "one trillion, two hundred thirteen billion, five hundred twenty-three million, two hundred five thousand, one".