126687557 has 4 divisors (see below), whose sum is σ = 126761580. Its totient is φ = 126613536.

The previous prime is 126687551. The next prime is 126687559. The reversal of 126687557 is 755786621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17986081 + 108701476 = 4241^2 + 10426^2 .

It is a cyclic number.

It is not a de Polignac number, because 126687557 - 2⁶ = 126687493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126687551) 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 3 ways as a sum of consecutive naturals, for example, 34382 + ... + 37887.

It is an arithmetic number, because the mean of its divisors is an integer number (31690395).

Almost surely, 2^126687557 is an apocalyptic number.

It is an amenable number.

126687557 is a deficient number, since it is larger than the sum of its proper divisors (74023).

126687557 is an equidigital number, since it uses as much as digits as its factorization.

126687557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74022.

The product of its digits is 705600, while the sum is 47.

The square root of 126687557 is about 11255.5567165734. The cubic root of 126687557 is about 502.2400255844.

The spelling of 126687557 in words is "one hundred twenty-six million, six hundred eighty-seven thousand, five hundred fifty-seven".