126645513 has 4 divisors (see below), whose sum is σ = 168860688. Its totient is φ = 84430340.

The previous prime is 126645479. The next prime is 126645517. The reversal of 126645513 is 315546621.

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 a cyclic number.

It is not a de Polignac number, because 126645513 - 2¹⁰ = 126644489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126645517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21107583 + ... + 21107588.

It is an arithmetic number, because the mean of its divisors is an integer number (42215172).

Almost surely, 2^126645513 is an apocalyptic number.

It is an amenable number.

126645513 is a deficient number, since it is larger than the sum of its proper divisors (42215175).

126645513 is an equidigital number, since it uses as much as digits as its factorization.

126645513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42215174.

The product of its digits is 21600, while the sum is 33.

The square root of 126645513 is about 11253.6888618799. The cubic root of 126645513 is about 502.1844597063.

The spelling of 126645513 in words is "one hundred twenty-six million, six hundred forty-five thousand, five hundred thirteen".