126517213 has 4 divisors (see below), whose sum is σ = 133959420. Its totient is φ = 119075008.

The previous prime is 126517211. The next prime is 126517229. The reversal of 126517213 is 312715621.

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 77475204 + 49042009 = 8802^2 + 7003^2 .

It is a cyclic number.

It is not a de Polignac number, because 126517213 - 2¹ = 126517211 is a prime.

It is a super-3 number, since 3×126517213³ (a number of 25 digits) contains 333 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 (126517211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3721078 + ... + 3721111.

It is an arithmetic number, because the mean of its divisors is an integer number (33489855).

Almost surely, 2^126517213 is an apocalyptic number.

It is an amenable number.

126517213 is a deficient number, since it is larger than the sum of its proper divisors (7442207).

126517213 is an equidigital number, since it uses as much as digits as its factorization.

126517213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7442206.

The product of its digits is 2520, while the sum is 28.

The square root of 126517213 is about 11247.9870643596. The cubic root of 126517213 is about 502.0148207558.

The spelling of 126517213 in words is "one hundred twenty-six million, five hundred seventeen thousand, two hundred thirteen".