1115513213 has 2 divisors, whose sum is σ = 1115513214. Its totient is φ = 1115513212.

The previous prime is 1115513209. The next prime is 1115513233. The reversal of 1115513213 is 3123155111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1086493444 + 29019769 = 32962^2 + 5387^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115513213 - 2² = 1115513209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1115513233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557756606 + 557756607.

It is an arithmetic number, because the mean of its divisors is an integer number (557756607).

Almost surely, 2^1115513213 is an apocalyptic number.

It is an amenable number.

1115513213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115513213 is an equidigital number, since it uses as much as digits as its factorization.

1115513213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 450, while the sum is 23.

The square root of 1115513213 is about 33399.2995884644. The cubic root of 1115513213 is about 1037.1102016199.

Adding to 1115513213 its reverse (3123155111), we get a palindrome (4238668324).

The spelling of 1115513213 in words is "one billion, one hundred fifteen million, five hundred thirteen thousand, two hundred thirteen".