1211131938 has 16 divisors (see below), whose sum is σ = 2467967616. Its totient is φ = 396093360.

The previous prime is 1211131913. The next prime is 1211131939. The reversal of 1211131938 is 8391311121.

It is not an unprimeable number, because it can be changed into a prime (1211131939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1903978 + ... + 1904613.

It is an arithmetic number, because the mean of its divisors is an integer number (154247976).

Almost surely, 2^1211131938 is an apocalyptic number.

1211131938 is an abundant number, since it is smaller than the sum of its proper divisors (1256835678).

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

1211131938 is a wasteful number, since it uses less digits than its factorization.

1211131938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3808649.

The product of its digits is 1296, while the sum is 30.

The square root of 1211131938 is about 34801.3209232063. The cubic root of 1211131938 is about 1065.9344185114.

The spelling of 1211131938 in words is "one billion, two hundred eleven million, one hundred thirty-one thousand, nine hundred thirty-eight".