1210001813 has 2 divisors, whose sum is σ = 1210001814. Its totient is φ = 1210001812.

The previous prime is 1210001801. The next prime is 1210001831. The reversal of 1210001813 is 3181000121.

Together with next prime (1210001831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 768287524 + 441714289 = 27718^2 + 21017^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210001813 - 2⁸ = 1210001557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210001791 and 1210001800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210001893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605000906 + 605000907.

It is an arithmetic number, because the mean of its divisors is an integer number (605000907).

Almost surely, 2^1210001813 is an apocalyptic number.

It is an amenable number.

1210001813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210001813 is an equidigital number, since it uses as much as digits as its factorization.

1210001813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 1210001813 is about 34785.0803218851. The cubic root of 1210001813 is about 1065.6027689804.

Adding to 1210001813 its reverse (3181000121), we get a palindrome (4391001934).

The spelling of 1210001813 in words is "one billion, two hundred ten million, one thousand, eight hundred thirteen".