126505641 has 4 divisors (see below), whose sum is σ = 168674192. Its totient is φ = 84337092.

The previous prime is 126505607. The next prime is 126505651. The reversal of 126505641 is 146505621.

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 not a de Polignac number, because 126505641 - 2¹⁰ = 126504617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126505599 and 126505608.

It is not an unprimeable number, because it can be changed into a prime (126505601) 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, 21084271 + ... + 21084276.

It is an arithmetic number, because the mean of its divisors is an integer number (42168548).

Almost surely, 2^126505641 is an apocalyptic number.

It is an amenable number.

126505641 is a deficient number, since it is larger than the sum of its proper divisors (42168551).

126505641 is an equidigital number, since it uses as much as digits as its factorization.

126505641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42168550.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 126505641 is about 11247.4726494444. The cubic root of 126505641 is about 501.9995145575. Note that the first 3 decimals are identical.

The spelling of 126505641 in words is "one hundred twenty-six million, five hundred five thousand, six hundred forty-one".