1212311131 has 8 divisors (see below), whose sum is σ = 1276555280. Its totient is φ = 1148110848.

The previous prime is 1212311119. The next prime is 1212311137. The reversal of 1212311131 is 1311132121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212311131 - 2⁷ = 1212311003 is a prime.

It is a super-2 number, since 2×1212311131² = 2939396556692998322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212311137) 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 7 ways as a sum of consecutive naturals, for example, 56455 + ... + 74911.

It is an arithmetic number, because the mean of its divisors is an integer number (159569410).

Almost surely, 2^1212311131 is an apocalyptic number.

1212311131 is a deficient number, since it is larger than the sum of its proper divisors (64244149).

1212311131 is a wasteful number, since it uses less digits than its factorization.

1212311131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21933.

The product of its digits is 36, while the sum is 16.

The square root of 1212311131 is about 34818.2585865520. The cubic root of 1212311131 is about 1066.2802478011.

Adding to 1212311131 its reverse (1311132121), we get a palindrome (2523443252).

The spelling of 1212311131 in words is "one billion, two hundred twelve million, three hundred eleven thousand, one hundred thirty-one".