1131212219 has 4 divisors (see below), whose sum is σ = 1131713040. Its totient is φ = 1130711400.

The previous prime is 1131212191. The next prime is 1131212237. The reversal of 1131212219 is 9122121311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9122121311 = 7187 ⋅1269253.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131212219 is a prime.

It is a super-2 number, since 2×1131212219² = 2559282168829807922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131212194 and 1131212203.

It is not an unprimeable number, because it can be changed into a prime (1131212279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247007 + ... + 251544.

It is an arithmetic number, because the mean of its divisors is an integer number (282928260).

Almost surely, 2^1131212219 is an apocalyptic number.

1131212219 is a deficient number, since it is larger than the sum of its proper divisors (500821).

1131212219 is an equidigital number, since it uses as much as digits as its factorization.

1131212219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500820.

The product of its digits is 216, while the sum is 23.

The square root of 1131212219 is about 33633.4984650720. The cubic root of 1131212219 is about 1041.9527595389.

The spelling of 1131212219 in words is "one billion, one hundred thirty-one million, two hundred twelve thousand, two hundred nineteen".