1213555313542 has 32 divisors (see below), whose sum is σ = 2188307278080. Its totient is φ = 497342553120.

The previous prime is 1213555313533. The next prime is 1213555313561. The reversal of 1213555313542 is 2453135553121.

It is a junction number, because it is equal to n+sod(n) for n = 1213555313495 and 1213555313504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49327242 + ... + 49351837.

It is an arithmetic number, because the mean of its divisors is an integer number (68384602440).

Almost surely, 2^{1213555313542} is an apocalyptic number.

1213555313542 is a deficient number, since it is larger than the sum of its proper divisors (974751964538).

1213555313542 is a wasteful number, since it uses less digits than its factorization.

1213555313542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98679148.

The product of its digits is 270000, while the sum is 40.

The spelling of 1213555313542 in words is "one trillion, two hundred thirteen billion, five hundred fifty-five million, three hundred thirteen thousand, five hundred forty-two".