125666729 has 2 divisors, whose sum is σ = 125666730. Its totient is φ = 125666728.

The previous prime is 125666711. The next prime is 125666753. The reversal of 125666729 is 927666521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111619225 + 14047504 = 10565^2 + 3748^2 .

It is a cyclic number.

It is not a de Polignac number, because 125666729 - 2¹² = 125662633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125666729.

It is not a weakly prime, because it can be changed into another prime (125666789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62833364 + 62833365.

It is an arithmetic number, because the mean of its divisors is an integer number (62833365).

Almost surely, 2^125666729 is an apocalyptic number.

It is an amenable number.

125666729 is a deficient number, since it is larger than the sum of its proper divisors (1).

125666729 is an equidigital number, since it uses as much as digits as its factorization.

125666729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 44.

The square root of 125666729 is about 11210.1172607605. The cubic root of 125666729 is about 500.8873961245.

The spelling of 125666729 in words is "one hundred twenty-five million, six hundred sixty-six thousand, seven hundred twenty-nine".