100521173 has 2 divisors, whose sum is σ = 100521174. Its totient is φ = 100521172.

The previous prime is 100521137. The next prime is 100521227. The reversal of 100521173 is 371125001.

Together with previous prime (100521137) 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., 63091249 + 37429924 = 7943^2 + 6118^2 .

It is a cyclic number.

It is not a de Polignac number, because 100521173 - 2¹² = 100517077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100521103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50260586 + 50260587.

It is an arithmetic number, because the mean of its divisors is an integer number (50260587).

Almost surely, 2^100521173 is an apocalyptic number.

It is an amenable number.

100521173 is a deficient number, since it is larger than the sum of its proper divisors (1).

100521173 is an equidigital number, since it uses as much as digits as its factorization.

100521173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 100521173 is about 10026.0247855269. The cubic root of 100521173 is about 464.9638434908.

Adding to 100521173 its reverse (371125001), we get a palindrome (471646174).

The spelling of 100521173 in words is "one hundred million, five hundred twenty-one thousand, one hundred seventy-three".