125503649 has 2 divisors, whose sum is σ = 125503650. Its totient is φ = 125503648.

The previous prime is 125503613. The next prime is 125503661. The reversal of 125503649 is 946305521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125104225 + 399424 = 11185^2 + 632^2 .

It is a cyclic number.

It is not a de Polignac number, because 125503649 - 2⁸ = 125503393 is a prime.

It is not a weakly prime, because it can be changed into another prime (125503349) 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, 62751824 + 62751825.

It is an arithmetic number, because the mean of its divisors is an integer number (62751825).

Almost surely, 2^125503649 is an apocalyptic number.

It is an amenable number.

125503649 is a deficient number, since it is larger than the sum of its proper divisors (1).

125503649 is an equidigital number, since it uses as much as digits as its factorization.

125503649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 125503649 is about 11202.8411128606. The cubic root of 125503649 is about 500.6706321030.

The spelling of 125503649 in words is "one hundred twenty-five million, five hundred three thousand, six hundred forty-nine".