126247013 has 4 divisors (see below), whose sum is σ = 126798540. Its totient is φ = 125695488.

The previous prime is 126246959. The next prime is 126247019. The reversal of 126247013 is 310742621.

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 66308449 + 59938564 = 8143^2 + 7742^2 .

It is a cyclic number.

It is not a de Polignac number, because 126247013 - 2⁶ = 126246949 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 (126247019) 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, 275420 + ... + 275877.

It is an arithmetic number, because the mean of its divisors is an integer number (31699635).

Almost surely, 2^126247013 is an apocalyptic number.

It is an amenable number.

126247013 is a deficient number, since it is larger than the sum of its proper divisors (551527).

126247013 is an equidigital number, since it uses as much as digits as its factorization.

126247013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551526.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 126247013 is about 11235.9696065805. The cubic root of 126247013 is about 501.6571854050.

Adding to 126247013 its reverse (310742621), we get a palindrome (436989634).

The spelling of 126247013 in words is "one hundred twenty-six million, two hundred forty-seven thousand, thirteen".