100521857 has 2 divisors, whose sum is σ = 100521858. Its totient is φ = 100521856.

The previous prime is 100521853. The next prime is 100521887. The reversal of 100521857 is 758125001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100320256 + 201601 = 10016^2 + 449^2 .

It is a cyclic number.

It is not a de Polignac number, because 100521857 - 2² = 100521853 is a prime.

It is not a weakly prime, because it can be changed into another prime (100521853) 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, 50260928 + 50260929.

It is an arithmetic number, because the mean of its divisors is an integer number (50260929).

Almost surely, 2^100521857 is an apocalyptic number.

It is an amenable number.

100521857 is a deficient number, since it is larger than the sum of its proper divisors (1).

100521857 is an equidigital number, since it uses as much as digits as its factorization.

100521857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 100521857 is about 10026.0588966952. The cubic root of 100521857 is about 464.9648981095.

Adding to 100521857 its reverse (758125001), we get a palindrome (858646858).

The spelling of 100521857 in words is "one hundred million, five hundred twenty-one thousand, eight hundred fifty-seven".