101020209 has 16 divisors (see below), whose sum is σ = 142859904. Its totient is φ = 63360000.

The previous prime is 101020189. The next prime is 101020217. The reversal of 101020209 is 902020101.

It is a happy number.

It is not a de Polignac number, because 101020209 - 2²⁰ = 99971633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (101020229) 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 in 15 ways as a sum of consecutive naturals, for example, 7792 + ... + 16209.

It is an arithmetic number, because the mean of its divisors is an integer number (8928744).

Almost surely, 2^101020209 is an apocalyptic number.

It is an amenable number.

101020209 is a deficient number, since it is larger than the sum of its proper divisors (41839695).

101020209 is a wasteful number, since it uses less digits than its factorization.

101020209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24088.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 101020209 is about 10050.8810061606. The cubic root of 101020209 is about 465.7320092717.

The spelling of 101020209 in words is "one hundred one million, twenty thousand, two hundred nine".