1213505454545 has 8 divisors (see below), whose sum is σ = 1457026030824. Its totient is φ = 970258040064.

The previous prime is 1213505454487. The next prime is 1213505454547. The reversal of 1213505454545 is 5454545053121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 74062356736 + 1139443097809 = 272144^2 + 1067447^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213505454545 - 2¹⁶ = 1213505389009 is a prime.

It is a super-2 number, since 2×1213505454545² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213505454496 and 1213505454505.

It is not an unprimeable number, because it can be changed into a prime (1213505454547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68280674 + ... + 68298443.

It is an arithmetic number, because the mean of its divisors is an integer number (182128253853).

Almost surely, 2^{1213505454545} is an apocalyptic number.

It is an amenable number.

1213505454545 is a deficient number, since it is larger than the sum of its proper divisors (243520576279).

1213505454545 is a wasteful number, since it uses less digits than its factorization.

1213505454545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136580899.

The product of its (nonzero) digits is 1200000, while the sum is 44.

The spelling of 1213505454545 in words is "one trillion, two hundred thirteen billion, five hundred five million, four hundred fifty-four thousand, five hundred forty-five".