1001123213 has 2 divisors, whose sum is σ = 1001123214. Its totient is φ = 1001123212.

The previous prime is 1001123203. The next prime is 1001123219. The reversal of 1001123213 is 3123211001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 972628969 + 28494244 = 31187^2 + 5338^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001123213 - 2⁸ = 1001122957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001123219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500561606 + 500561607.

It is an arithmetic number, because the mean of its divisors is an integer number (500561607).

Almost surely, 2^1001123213 is an apocalyptic number.

It is an amenable number.

1001123213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001123213 is an equidigital number, since it uses as much as digits as its factorization.

1001123213 is an evil number, because the sum of its binary digits is even.

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

The square root of 1001123213 is about 31640.5311744288. The cubic root of 1001123213 is about 1000.3742642421.

Adding to 1001123213 its reverse (3123211001), we get a palindrome (4124334214).

The spelling of 1001123213 in words is "one billion, one million, one hundred twenty-three thousand, two hundred thirteen".