20101094009 has 2 divisors, whose sum is σ = 20101094010. Its totient is φ = 20101094008.

The previous prime is 20101093967. The next prime is 20101094087. The reversal of 20101094009 is 90049010102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20065572409 + 35521600 = 141653^2 + 5960^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101094009 - 2²⁴ = 20084316793 is a prime.

It is a super-4 number, since 4×20101094009⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (20101094809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050547004 + 10050547005.

It is an arithmetic number, because the mean of its divisors is an integer number (10050547005).

Almost surely, 2^20101094009 is an apocalyptic number.

It is an amenable number.

20101094009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101094009 is an equidigital number, since it uses as much as digits as its factorization.

20101094009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 20101094009 in words is "twenty billion, one hundred one million, ninety-four thousand, nine".