1211164388 has 24 divisors (see below), whose sum is σ = 2564819712. Its totient is φ = 488536704.

The previous prime is 1211164379. The next prime is 1211164393. The reversal of 1211164388 is 8834611121.

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, 1271756 + ... + 1272707.

It is an arithmetic number, because the mean of its divisors is an integer number (106867488).

Almost surely, 2^1211164388 is an apocalyptic number.

It is an amenable number.

1211164388 is an abundant number, since it is smaller than the sum of its proper divisors (1353655324).

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

1211164388 is a wasteful number, since it uses less digits than its factorization.

1211164388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544491 (or 2544489 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 1211164388 is about 34801.7871380192. The cubic root of 1211164388 is about 1065.9439383283.

The spelling of 1211164388 in words is "one billion, two hundred eleven million, one hundred sixty-four thousand, three hundred eighty-eight".