1213805542 has 32 divisors (see below), whose sum is σ = 2015554752. Its totient is φ = 545301504.

The previous prime is 1213805531. The next prime is 1213805543. The reversal of 1213805542 is 2455083121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213805543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 509458 + ... + 511834.

It is an arithmetic number, because the mean of its divisors is an integer number (62986086).

Almost surely, 2^1213805542 is an apocalyptic number.

1213805542 is a deficient number, since it is larger than the sum of its proper divisors (801749210).

1213805542 is a wasteful number, since it uses less digits than its factorization.

1213805542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3072.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 1213805542 is about 34839.7121400278. The cubic root of 1213805542 is about 1066.7182010041.

Adding to 1213805542 its reverse (2455083121), we get a palindrome (3668888663).

The spelling of 1213805542 in words is "one billion, two hundred thirteen million, eight hundred five thousand, five hundred forty-two".