1213454243453 has 4 divisors (see below), whose sum is σ = 1213481318268. Its totient is φ = 1213427168640.

The previous prime is 1213454243431. The next prime is 1213454243459. The reversal of 1213454243453 is 3543424543121.

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 797168622649 + 416285620804 = 892843^2 + 645202^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213454243453 - 2³⁶ = 1144734766717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213454243453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213454243459) 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, 13470068 + ... + 13559853.

It is an arithmetic number, because the mean of its divisors is an integer number (303370329567).

Almost surely, 2^{1213454243453} is an apocalyptic number.

It is an amenable number.

1213454243453 is a deficient number, since it is larger than the sum of its proper divisors (27074815).

1213454243453 is an equidigital number, since it uses as much as digits as its factorization.

1213454243453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27074814.

The product of its digits is 691200, while the sum is 41.

Adding to 1213454243453 its reverse (3543424543121), we get a palindrome (4756878786574).

The spelling of 1213454243453 in words is "one trillion, two hundred thirteen billion, four hundred fifty-four million, two hundred forty-three thousand, four hundred fifty-three".