126983509 has 4 divisors (see below), whose sum is σ = 128410380. Its totient is φ = 125556640.

The previous prime is 126983503. The next prime is 126983513. The reversal of 126983509 is 905389621.

It is a happy number.

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 7409284 + 119574225 = 2722^2 + 10935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126983509 is a prime.

It is a super-2 number, since 2×126983509² = 32249623115906162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126983503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713302 + ... + 713479.

It is an arithmetic number, because the mean of its divisors is an integer number (32102595).

Almost surely, 2^126983509 is an apocalyptic number.

It is an amenable number.

126983509 is a deficient number, since it is larger than the sum of its proper divisors (1426871).

126983509 is an equidigital number, since it uses as much as digits as its factorization.

126983509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426870.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 126983509 is about 11268.6959760214. The cubic root of 126983509 is about 502.6308120449.

The spelling of 126983509 in words is "one hundred twenty-six million, nine hundred eighty-three thousand, five hundred nine".