1211516044 has 12 divisors (see below), whose sum is σ = 2122316784. Its totient is φ = 605139824.

The previous prime is 1211516041. The next prime is 1211516051. The reversal of 1211516044 is 4406151121.

It is a super-2 number, since 2×1211516044² = 2935542249738819872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211516041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150127 + ... + 157990.

It is an arithmetic number, because the mean of its divisors is an integer number (176859732).

Almost surely, 2^1211516044 is an apocalyptic number.

It is an amenable number.

1211516044 is a deficient number, since it is larger than the sum of its proper divisors (910800740).

1211516044 is a wasteful number, since it uses less digits than its factorization.

1211516044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309104 (or 309102 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1211516044 is about 34806.8390406253. The cubic root of 1211516044 is about 1066.0470923161.

Adding to 1211516044 its reverse (4406151121), we get a palindrome (5617667165).

The spelling of 1211516044 in words is "one billion, two hundred eleven million, five hundred sixteen thousand, forty-four".