1212311113 has 8 divisors (see below), whose sum is σ = 1306758600. Its totient is φ = 1118034048.

The previous prime is 1212311101. The next prime is 1212311119. The reversal of 1212311113 is 3111132121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4609609 + 1207701504 = 2147^2 + 34752^2 .

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 1212311113 - 2⁵ = 1212311081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212311119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27628 + ... + 56461.

It is an arithmetic number, because the mean of its divisors is an integer number (163344825).

Almost surely, 2^1212311113 is an apocalyptic number.

1212311113 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1212311113 is a deficient number, since it is larger than the sum of its proper divisors (94447487).

1212311113 is a wasteful number, since it uses less digits than its factorization.

1212311113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85211.

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

The square root of 1212311113 is about 34818.2583280669. The cubic root of 1212311113 is about 1066.2802425238.

Adding to 1212311113 its reverse (3111132121), we get a palindrome (4323443234).

The spelling of 1212311113 in words is "one billion, two hundred twelve million, three hundred eleven thousand, one hundred thirteen".