126657985 has 4 divisors (see below), whose sum is σ = 151989588. Its totient is φ = 101326384.

The previous prime is 126657959. The next prime is 126658001. The reversal of 126657985 is 589756621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589756621 = 191 ⋅3087731.

It can be written as a sum of positive squares in 2 ways, for example, as 35856144 + 90801841 = 5988^2 + 9529^2 .

It is a cyclic number.

It is not a de Polignac number, because 126657985 - 2⁵ = 126657953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 12665794 + ... + 12665803.

It is an arithmetic number, because the mean of its divisors is an integer number (37997397).

Almost surely, 2^126657985 is an apocalyptic number.

It is an amenable number.

126657985 is a deficient number, since it is larger than the sum of its proper divisors (25331603).

126657985 is an equidigital number, since it uses as much as digits as its factorization.

126657985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25331602.

The product of its digits is 907200, while the sum is 49.

The square root of 126657985 is about 11254.2429776507. The cubic root of 126657985 is about 502.2009441408.

The spelling of 126657985 in words is "one hundred twenty-six million, six hundred fifty-seven thousand, nine hundred eighty-five".