1213544434550 has 72 divisors (see below), whose sum is σ = 2626533966960. Its totient is φ = 415942430400.

The previous prime is 1213544434493. The next prime is 1213544434589. The reversal of 1213544434550 is 554344453121.

It is a junction number, because it is equal to n+sod(n) for n = 1213544434498 and 1213544434507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7938236 + ... + 8089664.

It is an arithmetic number, because the mean of its divisors is an integer number (36479638430).

Almost surely, 2^{1213544434550} is an apocalyptic number.

1213544434550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213544434550 is an abundant number, since it is smaller than the sum of its proper divisors (1412989532410).

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

1213544434550 is a wasteful number, since it uses less digits than its factorization.

1213544434550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154726 (or 154714 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 41.

Adding to 1213544434550 its reverse (554344453121), we get a palindrome (1767888887671).

The spelling of 1213544434550 in words is "one trillion, two hundred thirteen billion, five hundred forty-four million, four hundred thirty-four thousand, five hundred fifty".