920101909 has 4 divisors (see below), whose sum is σ = 920354220. Its totient is φ = 919849600.

The previous prime is 920101901. The next prime is 920101927. The reversal of 920101909 is 909101029.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 691427025 + 228674884 = 26295^2 + 15122^2 .

It is a cyclic number.

It is not a de Polignac number, because 920101909 - 2³ = 920101901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920101901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120604 + ... + 128005.

It is an arithmetic number, because the mean of its divisors is an integer number (230088555).

Almost surely, 2^920101909 is an apocalyptic number.

It is an amenable number.

920101909 is a deficient number, since it is larger than the sum of its proper divisors (252311).

920101909 is a wasteful number, since it uses less digits than its factorization.

920101909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252310.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 920101909 is about 30333.1816498039. The cubic root of 920101909 is about 972.6247363258.

The spelling of 920101909 in words is "nine hundred twenty million, one hundred one thousand, nine hundred nine".