1001231213 has 2 divisors, whose sum is σ = 1001231214. Its totient is φ = 1001231212.

The previous prime is 1001231159. The next prime is 1001231237. The reversal of 1001231213 is 3121321001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581677924 + 419553289 = 24118^2 + 20483^2 .

It is an emirp because it is prime and its reverse (3121321001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001231213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001231243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500615606 + 500615607.

It is an arithmetic number, because the mean of its divisors is an integer number (500615607).

Almost surely, 2^1001231213 is an apocalyptic number.

It is an amenable number.

1001231213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001231213 is an equidigital number, since it uses as much as digits as its factorization.

1001231213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1001231213 is about 31642.2378001304. The cubic root of 1001231213 is about 1000.4102360167.

Adding to 1001231213 its reverse (3121321001), we get a palindrome (4122552214).

The spelling of 1001231213 in words is "one billion, one million, two hundred thirty-one thousand, two hundred thirteen".