1211011313 has 4 divisors (see below), whose sum is σ = 1211827200. Its totient is φ = 1210195428.

The previous prime is 1211011283. The next prime is 1211011339. The reversal of 1211011313 is 3131101121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3131101121 = 97 ⋅32279393.

It is a cyclic number.

It is not a de Polignac number, because 1211011313 - 2¹⁴ = 1210994929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211011013) 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 3 ways as a sum of consecutive naturals, for example, 405713 + ... + 408686.

It is an arithmetic number, because the mean of its divisors is an integer number (302956800).

Almost surely, 2^1211011313 is an apocalyptic number.

It is an amenable number.

1211011313 is a deficient number, since it is larger than the sum of its proper divisors (815887).

1211011313 is an equidigital number, since it uses as much as digits as its factorization.

1211011313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815886.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1211011313 is about 34799.5878280189. The cubic root of 1211011313 is about 1065.8990294113.

Adding to 1211011313 its reverse (3131101121), we get a palindrome (4342112434).

The spelling of 1211011313 in words is "one billion, two hundred eleven million, eleven thousand, three hundred thirteen".