20109209511541 has 2 divisors, whose sum is σ = 20109209511542. Its totient is φ = 20109209511540.

The previous prime is 20109209511539. The next prime is 20109209511673. The reversal of 20109209511541 is 14511590290102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20087113878225 + 22095633316 = 4481865^2 + 148646^2 .

It is a cyclic number.

It is not a de Polignac number, because 20109209511541 - 2¹ = 20109209511539 is a prime.

Together with 20109209511539, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20109209511494 and 20109209511503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20109209211541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10054604755770 + 10054604755771.

It is an arithmetic number, because the mean of its divisors is an integer number (10054604755771).

Almost surely, 2^{20109209511541} is an apocalyptic number.

It is an amenable number.

20109209511541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109209511541 is an equidigital number, since it uses as much as digits as its factorization.

20109209511541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 40.

The spelling of 20109209511541 in words is "twenty trillion, one hundred nine billion, two hundred nine million, five hundred eleven thousand, five hundred forty-one".