1211413918 has 16 divisors (see below), whose sum is σ = 2134799856. Its totient is φ = 508285440.

The previous prime is 1211413909. The next prime is 1211413949. The reversal of 1211413918 is 8193141121.

It is a super-3 number, since 3×1211413918³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1211413918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2117571 + ... + 2118142.

It is an arithmetic number, because the mean of its divisors is an integer number (133424991).

Almost surely, 2^1211413918 is an apocalyptic number.

1211413918 is a deficient number, since it is larger than the sum of its proper divisors (923385938).

1211413918 is a wasteful number, since it uses less digits than its factorization.

1211413918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4235739.

The product of its digits is 1728, while the sum is 31.

The square root of 1211413918 is about 34805.3719704301. The cubic root of 1211413918 is about 1066.0171369597.

The spelling of 1211413918 in words is "one billion, two hundred eleven million, four hundred thirteen thousand, nine hundred eighteen".