1213454350553 has 4 divisors (see below), whose sum is σ = 1213478105268. Its totient is φ = 1213430595840.

The previous prime is 1213454350541. The next prime is 1213454350583. The reversal of 1213454350553 is 3550534543121.

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 610823528704 + 602630821849 = 781552^2 + 776293^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213454350553 - 2¹⁸ = 1213454088409 is a prime.

It is a super-2 number, since 2×1213454350553² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213454350553.

It is not an unprimeable number, because it can be changed into a prime (1213454350583) 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, 11800568 + ... + 11902953.

It is an arithmetic number, because the mean of its divisors is an integer number (303369526317).

Almost surely, 2^{1213454350553} is an apocalyptic number.

It is an amenable number.

1213454350553 is a deficient number, since it is larger than the sum of its proper divisors (23754715).

1213454350553 is an equidigital number, since it uses as much as digits as its factorization.

1213454350553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23754714.

The product of its (nonzero) digits is 540000, while the sum is 41.

Adding to 1213454350553 its reverse (3550534543121), we get a palindrome (4763988893674).

The spelling of 1213454350553 in words is "one trillion, two hundred thirteen billion, four hundred fifty-four million, three hundred fifty thousand, five hundred fifty-three".