126813129 has 4 divisors (see below), whose sum is σ = 169084176. Its totient is φ = 84542084.

The previous prime is 126813079. The next prime is 126813151. The reversal of 126813129 is 921318621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126813129 - 2¹¹ = 126811081 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 126813129.

It is not an unprimeable number, because it can be changed into a prime (126811129) 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, 21135519 + ... + 21135524.

It is an arithmetic number, because the mean of its divisors is an integer number (42271044).

Almost surely, 2^126813129 is an apocalyptic number.

It is an amenable number.

126813129 is a deficient number, since it is larger than the sum of its proper divisors (42271047).

126813129 is an equidigital number, since it uses as much as digits as its factorization.

126813129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42271046.

The product of its digits is 5184, while the sum is 33.

The square root of 126813129 is about 11261.1335575065. The cubic root of 126813129 is about 502.4059099594.

The spelling of 126813129 in words is "one hundred twenty-six million, eight hundred thirteen thousand, one hundred twenty-nine".