1216541042 has 16 divisors (see below), whose sum is σ = 1832064000. Its totient is φ = 605858832.

The previous prime is 1216541009. The next prime is 1216541057. The reversal of 1216541042 is 2401456121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 730703 + ... + 732365.

It is an arithmetic number, because the mean of its divisors is an integer number (114504000).

Almost surely, 2^1216541042 is an apocalyptic number.

1216541042 is a deficient number, since it is larger than the sum of its proper divisors (615522958).

1216541042 is a wasteful number, since it uses less digits than its factorization.

1216541042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1216541042 is about 34878.9484073130. The cubic root of 1216541042 is about 1067.5189383591.

Adding to 1216541042 its reverse (2401456121), we get a palindrome (3617997163).

The spelling of 1216541042 in words is "one billion, two hundred sixteen million, five hundred forty-one thousand, forty-two".