125686522 has 16 divisors (see below), whose sum is σ = 210034440. Its totient is φ = 56008512.

The previous prime is 125686481. The next prime is 125686531. The reversal of 125686522 is 225686521.

It is a Cunningham number, because it is equal to 11211²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 65918161 + 59768361 = 8119^2 + 7731^2 .

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 82593 + ... + 84100.

Almost surely, 2^125686522 is an apocalyptic number.

125686522 is a deficient number, since it is larger than the sum of its proper divisors (84347918).

125686522 is a wasteful number, since it uses less digits than its factorization.

125686522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166737.

The product of its digits is 57600, while the sum is 37.

The square root of 125686522 is about 11211.0000445991. Note that the first 4 decimals coincide. The cubic root of 125686522 is about 500.9136919835.

Subtracting 125686522 from its reverse (225686521), we obtain a palindrome (99999999).

It can be divided in two parts, 1256 and 86522, that added together give a palindrome (87778).

The spelling of 125686522 in words is "one hundred twenty-five million, six hundred eighty-six thousand, five hundred twenty-two".