126511013 has 4 divisors (see below), whose sum is σ = 126542220. Its totient is φ = 126479808.

The previous prime is 126511003. The next prime is 126511019. The reversal of 126511013 is 310115621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310115621 = 1259 ⋅246319.

It can be written as a sum of positive squares in 2 ways, for example, as 14002564 + 112508449 = 3742^2 + 10607^2 .

It is a cyclic number.

It is not a de Polignac number, because 126511013 - 2⁴ = 126510997 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 (126511019) 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, 8420 + ... + 17997.

It is an arithmetic number, because the mean of its divisors is an integer number (31635555).

Almost surely, 2^126511013 is an apocalyptic number.

It is an amenable number.

126511013 is a deficient number, since it is larger than the sum of its proper divisors (31207).

126511013 is an equidigital number, since it uses as much as digits as its factorization.

126511013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31206.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 126511013 is about 11247.7114561141. The cubic root of 126511013 is about 502.0066201780.

Adding to 126511013 its reverse (310115621), we get a palindrome (436626634).

The spelling of 126511013 in words is "one hundred twenty-six million, five hundred eleven thousand, thirteen".