125172161 has 2 divisors, whose sum is σ = 125172162. Its totient is φ = 125172160.

The previous prime is 125172127. The next prime is 125172169. The reversal of 125172161 is 161271521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88642225 + 36529936 = 9415^2 + 6044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125172161 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125172161.

It is not a weakly prime, because it can be changed into another prime (125172169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62586080 + 62586081.

It is an arithmetic number, because the mean of its divisors is an integer number (62586081).

Almost surely, 2^125172161 is an apocalyptic number.

It is an amenable number.

125172161 is a deficient number, since it is larger than the sum of its proper divisors (1).

125172161 is an equidigital number, since it uses as much as digits as its factorization.

125172161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 26.

The square root of 125172161 is about 11188.0365122751. The cubic root of 125172161 is about 500.2294426960.

The spelling of 125172161 in words is "one hundred twenty-five million, one hundred seventy-two thousand, one hundred sixty-one".