1131222100 has 18 divisors (see below), whose sum is σ = 2454752174. Its totient is φ = 452488800.

The previous prime is 1131222097. The next prime is 1131222101. The reversal of 1131222100 is 12221311.

It can be written as a sum of positive squares in 3 ways, for example, as 9909904 + 1121312196 = 3148^2 + 33486^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131222101) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 5656011 + ... + 5656210.

Almost surely, 2^1131222100 is an apocalyptic number.

1131222100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131222100 is an abundant number, since it is smaller than the sum of its proper divisors (1323530074).

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

1131222100 is a wasteful number, since it uses less digits than its factorization.

1131222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11312235 (or 11312228 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1131222100 is about 33633.6453569933. The cubic root of 1131222100 is about 1041.9557933066.

Adding to 1131222100 its reverse (12221311), we get a palindrome (1143443411).

The spelling of 1131222100 in words is "one billion, one hundred thirty-one million, two hundred twenty-two thousand, one hundred".