1213401535544 has 48 divisors (see below), whose sum is σ = 2506233433200. Its totient is φ = 550339067520.

The previous prime is 1213401535531. The next prime is 1213401535559. The reversal of 1213401535544 is 4455351043121.

It is a junction number, because it is equal to n+sod(n) for n = 1213401535498 and 1213401535507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 929084 + ... + 1813835.

It is an arithmetic number, because the mean of its divisors is an integer number (52213196525).

Almost surely, 2^{1213401535544} is an apocalyptic number.

It is an amenable number.

1213401535544 is an abundant number, since it is smaller than the sum of its proper divisors (1292831897656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213401535544 is a wasteful number, since it uses less digits than its factorization.

1213401535544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743404 (or 2743389 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 1213401535544 its reverse (4455351043121), we get a palindrome (5668752578665).

The spelling of 1213401535544 in words is "one trillion, two hundred thirteen billion, four hundred one million, five hundred thirty-five thousand, five hundred forty-four".