20125443197 has 2 divisors, whose sum is σ = 20125443198. Its totient is φ = 20125443196.

The previous prime is 20125443157. The next prime is 20125443241. The reversal of 20125443197 is 79134452102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18088636036 + 2036807161 = 134494^2 + 45131^2 .

It is a cyclic number.

It is not a de Polignac number, because 20125443197 - 2¹² = 20125439101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20125443197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20125443157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062721598 + 10062721599.

It is an arithmetic number, because the mean of its divisors is an integer number (10062721599).

Almost surely, 2^20125443197 is an apocalyptic number.

It is an amenable number.

20125443197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125443197 is an equidigital number, since it uses as much as digits as its factorization.

20125443197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

Adding to 20125443197 its reverse (79134452102), we get a palindrome (99259895299).

The spelling of 20125443197 in words is "twenty billion, one hundred twenty-five million, four hundred forty-three thousand, one hundred ninety-seven".