1213112113 has 2 divisors, whose sum is σ = 1213112114. Its totient is φ = 1213112112.

The previous prime is 1213112083. The next prime is 1213112123. The reversal of 1213112113 is 3112113121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1085241249 + 127870864 = 32943^2 + 11308^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213112113 - 2¹³ = 1213103921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213112123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606556056 + 606556057.

It is an arithmetic number, because the mean of its divisors is an integer number (606556057).

Almost surely, 2^1213112113 is an apocalyptic number.

It is an amenable number.

1213112113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213112113 is an equidigital number, since it uses as much as digits as its factorization.

1213112113 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1213112113 is about 34829.7590143831. The cubic root of 1213112113 is about 1066.5150289107.

Adding to 1213112113 its reverse (3112113121), we get a palindrome (4325225234).

It can be divided in two parts, 121 and 3112113, that multiplied together give a palindrome (376565673).

The spelling of 1213112113 in words is "one billion, two hundred thirteen million, one hundred twelve thousand, one hundred thirteen".