126208813 has 4 divisors (see below), whose sum is σ = 129619900. Its totient is φ = 122797728.

The previous prime is 126208807. The next prime is 126208837. The reversal of 126208813 is 318802621.

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 119639844 + 6568969 = 10938^2 + 2563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126208813 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 (126208213) 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, 1705488 + ... + 1705561.

It is an arithmetic number, because the mean of its divisors is an integer number (32404975).

Almost surely, 2^126208813 is an apocalyptic number.

It is an amenable number.

126208813 is a deficient number, since it is larger than the sum of its proper divisors (3411087).

126208813 is an equidigital number, since it uses as much as digits as its factorization.

126208813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3411086.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 126208813 is about 11234.2695801730. The cubic root of 126208813 is about 501.6065829203.

The spelling of 126208813 in words is "one hundred twenty-six million, two hundred eight thousand, eight hundred thirteen".