101242909 has 2 divisors, whose sum is σ = 101242910. Its totient is φ = 101242908.

The previous prime is 101242907. The next prime is 101242919. The reversal of 101242909 is 909242101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76212900 + 25030009 = 8730^2 + 5003^2 .

It is an emirp because it is prime and its reverse (909242101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101242909 - 2¹ = 101242907 is a prime.

Together with 101242907, 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 (101242901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50621454 + 50621455.

It is an arithmetic number, because the mean of its divisors is an integer number (50621455).

Almost surely, 2^101242909 is an apocalyptic number.

It is an amenable number.

101242909 is a deficient number, since it is larger than the sum of its proper divisors (1).

101242909 is an equidigital number, since it uses as much as digits as its factorization.

101242909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 101242909 is about 10061.9535379567. The cubic root of 101242909 is about 466.0739949548.

The spelling of 101242909 in words is "one hundred one million, two hundred forty-two thousand, nine hundred nine".