126509657 has 16 divisors (see below), whose sum is σ = 135970560. Its totient is φ = 117355392.

The previous prime is 126509639. The next prime is 126509701. The reversal of 126509657 is 756905621.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126509657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126509857) 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 in 15 ways as a sum of consecutive naturals, for example, 273008 + ... + 273470.

It is an arithmetic number, because the mean of its divisors is an integer number (8498160).

Almost surely, 2^126509657 is an apocalyptic number.

It is an amenable number.

126509657 is a deficient number, since it is larger than the sum of its proper divisors (9460903).

126509657 is a wasteful number, since it uses less digits than its factorization.

126509657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 126509657 is about 11247.6511770236. The cubic root of 126509657 is about 502.0048265966.

The spelling of 126509657 in words is "one hundred twenty-six million, five hundred nine thousand, six hundred fifty-seven".