1213525435542 has 32 divisors (see below), whose sum is σ = 2773901760000. Its totient is φ = 346705386048.

The previous prime is 1213525435541. The next prime is 1213525435559. The reversal of 1213525435542 is 2455345253121.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1213525435494 and 1213525435503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213525435541) by changing a digit.

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, 252834 + ... + 1578282.

It is an arithmetic number, because the mean of its divisors is an integer number (86684430000).

Almost surely, 2^{1213525435542} is an apocalyptic number.

1213525435542 is an abundant number, since it is smaller than the sum of its proper divisors (1560376324458).

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

1213525435542 is a wasteful number, since it uses less digits than its factorization.

1213525435542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347260.

The product of its digits is 720000, while the sum is 42.

The spelling of 1213525435542 in words is "one trillion, two hundred thirteen billion, five hundred twenty-five million, four hundred thirty-five thousand, five hundred forty-two".