100695509 has 2 divisors, whose sum is σ = 100695510. Its totient is φ = 100695508.

The previous prime is 100695503. The next prime is 100695521. The reversal of 100695509 is 905596001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100440484 + 255025 = 10022^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 100695509 - 2⁴ = 100695493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100695503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50347754 + 50347755.

It is an arithmetic number, because the mean of its divisors is an integer number (50347755).

Almost surely, 2^100695509 is an apocalyptic number.

It is an amenable number.

100695509 is a deficient number, since it is larger than the sum of its proper divisors (1).

100695509 is an equidigital number, since it uses as much as digits as its factorization.

100695509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 100695509 is about 10034.7151927695. The cubic root of 100695509 is about 465.2324871273.

The spelling of 100695509 in words is "one hundred million, six hundred ninety-five thousand, five hundred nine".