126213513 has 4 divisors (see below), whose sum is σ = 168284688. Its totient is φ = 84142340.

The previous prime is 126213509. The next prime is 126213517. The reversal of 126213513 is 315312621.

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 an interprime number because it is at equal distance from previous prime (126213509) and next prime (126213517).

It is a cyclic number.

It is not a de Polignac number, because 126213513 - 2² = 126213509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126213517) 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, 21035583 + ... + 21035588.

It is an arithmetic number, because the mean of its divisors is an integer number (42071172).

Almost surely, 2^126213513 is an apocalyptic number.

It is an amenable number.

126213513 is a deficient number, since it is larger than the sum of its proper divisors (42071175).

126213513 is an equidigital number, since it uses as much as digits as its factorization.

126213513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42071174.

The product of its digits is 1080, while the sum is 24.

The square root of 126213513 is about 11234.4787596043. The cubic root of 126213513 is about 501.6128094313.

The spelling of 126213513 in words is "one hundred twenty-six million, two hundred thirteen thousand, five hundred thirteen".