100321813 has 2 divisors, whose sum is σ = 100321814. Its totient is φ = 100321812.

The previous prime is 100321807. The next prime is 100321831. The reversal of 100321813 is 318123001.

Together with next prime (100321831) 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., 59336209 + 40985604 = 7703^2 + 6402^2 .

It is a cyclic number.

It is not a de Polignac number, because 100321813 - 2¹³ = 100313621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100321853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50160906 + 50160907.

It is an arithmetic number, because the mean of its divisors is an integer number (50160907).

Almost surely, 2^100321813 is an apocalyptic number.

It is an amenable number.

100321813 is a deficient number, since it is larger than the sum of its proper divisors (1).

100321813 is an equidigital number, since it uses as much as digits as its factorization.

100321813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 100321813 is about 10016.0777253374. The cubic root of 100321813 is about 464.6562580792.

Adding to 100321813 its reverse (318123001), we get a palindrome (418444814).

The spelling of 100321813 in words is "one hundred million, three hundred twenty-one thousand, eight hundred thirteen".