125920169 has 2 divisors, whose sum is σ = 125920170. Its totient is φ = 125920168.

The previous prime is 125920153. The next prime is 125920177. The reversal of 125920169 is 961029521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68690944 + 57229225 = 8288^2 + 7565^2 .

It is a cyclic number.

It is not a de Polignac number, because 125920169 - 2⁴ = 125920153 is a prime.

It is a super-2 number, since 2×125920169² = 31711777921977122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125920129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62960084 + 62960085.

It is an arithmetic number, because the mean of its divisors is an integer number (62960085).

Almost surely, 2^125920169 is an apocalyptic number.

It is an amenable number.

125920169 is a deficient number, since it is larger than the sum of its proper divisors (1).

125920169 is an equidigital number, since it uses as much as digits as its factorization.

125920169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 125920169 is about 11221.4156415312. The cubic root of 125920169 is about 501.2238937239.

The spelling of 125920169 in words is "one hundred twenty-five million, nine hundred twenty thousand, one hundred sixty-nine".