1001243213 has 4 divisors (see below), whose sum is σ = 1002301440. Its totient is φ = 1000184988.

The previous prime is 1001243179. The next prime is 1001243219. The reversal of 1001243213 is 3123421001.

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.

It is a cyclic number.

It is not a de Polignac number, because 1001243213 - 2⁶ = 1001243149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001243191 and 1001243200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001243219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527693 + ... + 529586.

It is an arithmetic number, because the mean of its divisors is an integer number (250575360).

Almost surely, 2^1001243213 is an apocalyptic number.

It is an amenable number.

1001243213 is a deficient number, since it is larger than the sum of its proper divisors (1058227).

1001243213 is an equidigital number, since it uses as much as digits as its factorization.

1001243213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058226.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1001243213 is about 31642.4274195265. The cubic root of 1001243213 is about 1000.4142327209.

Adding to 1001243213 its reverse (3123421001), we get a palindrome (4124664214).

The spelling of 1001243213 in words is "one billion, one million, two hundred forty-three thousand, two hundred thirteen".