125681329 has 2 divisors, whose sum is σ = 125681330. Its totient is φ = 125681328.

The previous prime is 125681299. The next prime is 125681363. The reversal of 125681329 is 923186521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86992929 + 38688400 = 9327^2 + 6220^2 .

It is a cyclic number.

It is not a de Polignac number, because 125681329 - 2¹³ = 125673137 is a prime.

It is not a weakly prime, because it can be changed into another prime (125681929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62840664 + 62840665.

It is an arithmetic number, because the mean of its divisors is an integer number (62840665).

Almost surely, 2^125681329 is an apocalyptic number.

It is an amenable number.

125681329 is a deficient number, since it is larger than the sum of its proper divisors (1).

125681329 is an equidigital number, since it uses as much as digits as its factorization.

125681329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 125681329 is about 11210.7684393176. The cubic root of 125681329 is about 500.9067931249.

The spelling of 125681329 in words is "one hundred twenty-five million, six hundred eighty-one thousand, three hundred twenty-nine".