20523151171 has 2 divisors, whose sum is σ = 20523151172. Its totient is φ = 20523151170.

The previous prime is 20523151153. The next prime is 20523151199. The reversal of 20523151171 is 17115132502.

It is an a-pointer prime, because the next prime (20523151199) can be obtained adding 20523151171 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20523151171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20523151141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261575585 + 10261575586.

It is an arithmetic number, because the mean of its divisors is an integer number (10261575586).

Almost surely, 2^20523151171 is an apocalyptic number.

20523151171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20523151171 is an equidigital number, since it uses as much as digits as its factorization.

20523151171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 28.

Adding to 20523151171 its reverse (17115132502), we get a palindrome (37638283673).

The spelling of 20523151171 in words is "twenty billion, five hundred twenty-three million, one hundred fifty-one thousand, one hundred seventy-one".