125311661 has 2 divisors, whose sum is σ = 125311662. Its totient is φ = 125311660.

The previous prime is 125311651. The next prime is 125311679. The reversal of 125311661 is 166113521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122522761 + 2788900 = 11069^2 + 1670^2 .

It is a cyclic number.

It is not a de Polignac number, because 125311661 - 2⁶ = 125311597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125311661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125311601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62655830 + 62655831.

It is an arithmetic number, because the mean of its divisors is an integer number (62655831).

Almost surely, 2^125311661 is an apocalyptic number.

It is an amenable number.

125311661 is a deficient number, since it is larger than the sum of its proper divisors (1).

125311661 is an equidigital number, since it uses as much as digits as its factorization.

125311661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 125311661 is about 11194.2691141494. The cubic root of 125311661 is about 500.4152031173.

The spelling of 125311661 in words is "one hundred twenty-five million, three hundred eleven thousand, six hundred sixty-one".