125821061 has 2 divisors, whose sum is σ = 125821062. Its totient is φ = 125821060.

The previous prime is 125821049. The next prime is 125821067. The reversal of 125821061 is 160128521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113529025 + 12292036 = 10655^2 + 3506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125821061 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 125821061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125821067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62910530 + 62910531.

It is an arithmetic number, because the mean of its divisors is an integer number (62910531).

Almost surely, 2^125821061 is an apocalyptic number.

It is an amenable number.

125821061 is a deficient number, since it is larger than the sum of its proper divisors (1).

125821061 is an equidigital number, since it uses as much as digits as its factorization.

125821061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 125821061 is about 11216.9987518944. The cubic root of 125821061 is about 501.0923597624.

Adding to 125821061 its reverse (160128521), we get a palindrome (285949582).

The spelling of 125821061 in words is "one hundred twenty-five million, eight hundred twenty-one thousand, sixty-one".