125681641 has 2 divisors, whose sum is σ = 125681642. Its totient is φ = 125681640.

The previous prime is 125681627. The next prime is 125681669. The reversal of 125681641 is 146186521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107226025 + 18455616 = 10355^2 + 4296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125681641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125681597 and 125681606.

It is not a weakly prime, because it can be changed into another prime (125681681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62840820 + 62840821.

It is an arithmetic number, because the mean of its divisors is an integer number (62840821).

Almost surely, 2^125681641 is an apocalyptic number.

It is an amenable number.

125681641 is a deficient number, since it is larger than the sum of its proper divisors (1).

125681641 is an equidigital number, since it uses as much as digits as its factorization.

125681641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 125681641 is about 11210.7823545014. The cubic root of 125681641 is about 500.9072076198.

The spelling of 125681641 in words is "one hundred twenty-five million, six hundred eighty-one thousand, six hundred forty-one".