1213031113 has 6 divisors (see below), whose sum is σ = 1411077066. Its totient is φ = 1039740912.

The previous prime is 1213031101. The next prime is 1213031137. The reversal of 1213031113 is 3111303121.

It can be written as a sum of positive squares in only one way, i.e., 1161650889 + 51380224 = 34083^2 + 7168^2 .

It is not a de Polignac number, because 1213031113 - 2⁹ = 1213030601 is a prime.

It is a super-2 number, since 2×1213031113² = 2942888962212037538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213031143) 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 5 ways as a sum of consecutive naturals, for example, 12377820 + ... + 12377917.

It is an arithmetic number, because the mean of its divisors is an integer number (235179511).

Almost surely, 2^1213031113 is an apocalyptic number.

It is an amenable number.

1213031113 is a deficient number, since it is larger than the sum of its proper divisors (198045953).

1213031113 is an equidigital number, since it uses as much as digits as its factorization.

1213031113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24755751 (or 24755744 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1213031113 is about 34828.5961962293. The cubic root of 1213031113 is about 1066.4912911651.

Adding to 1213031113 its reverse (3111303121), we get a palindrome (4324334234).

The spelling of 1213031113 in words is "one billion, two hundred thirteen million, thirty-one thousand, one hundred thirteen".