1211002813 has 2 divisors, whose sum is σ = 1211002814. Its totient is φ = 1211002812.

The previous prime is 1211002801. The next prime is 1211002873. The reversal of 1211002813 is 3182001121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 945378009 + 265624804 = 30747^2 + 16298^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211002813 - 2²¹ = 1208905661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211002873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605501406 + 605501407.

It is an arithmetic number, because the mean of its divisors is an integer number (605501407).

Almost surely, 2^1211002813 is an apocalyptic number.

It is an amenable number.

1211002813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211002813 is an equidigital number, since it uses as much as digits as its factorization.

1211002813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1211002813 is about 34799.4656999213. The cubic root of 1211002813 is about 1065.8965355830.

Adding to 1211002813 its reverse (3182001121), we get a palindrome (4393003934).

The spelling of 1211002813 in words is "one billion, two hundred eleven million, two thousand, eight hundred thirteen".