100215541 has 2 divisors, whose sum is σ = 100215542. Its totient is φ = 100215540.

The previous prime is 100215539. The next prime is 100215569. The reversal of 100215541 is 145512001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78322500 + 21893041 = 8850^2 + 4679^2 .

It is a cyclic number.

It is not a de Polignac number, because 100215541 - 2¹ = 100215539 is a prime.

Together with 100215539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100215341) 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 as a sum of consecutive naturals, namely, 50107770 + 50107771.

It is an arithmetic number, because the mean of its divisors is an integer number (50107771).

Almost surely, 2^100215541 is an apocalyptic number.

It is an amenable number.

100215541 is a deficient number, since it is larger than the sum of its proper divisors (1).

100215541 is an equidigital number, since it uses as much as digits as its factorization.

100215541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 100215541 is about 10010.7712490097. The cubic root of 100215541 is about 464.4921282823.

Adding to 100215541 its reverse (145512001), we get a palindrome (245727542).

The spelling of 100215541 in words is "one hundred million, two hundred fifteen thousand, five hundred forty-one".