126505503 has 8 divisors (see below), whose sum is σ = 187415600. Its totient is φ = 84336984.

The previous prime is 126505501. The next prime is 126505559. The reversal of 126505503 is 305505621.

126505503 is a `hidden beast` number, since 1 + 2 + 650 + 5 + 5 + 0 + 3 = 666.

It is not a de Polignac number, because 126505503 - 2¹ = 126505501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4685389 = 126505503 / (1 + 2 + 6 + 5 + 0 + 5 + 5 + 0 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126505501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2342668 + ... + 2342721.

It is an arithmetic number, because the mean of its divisors is an integer number (23426950).

Almost surely, 2^126505503 is an apocalyptic number.

126505503 is a deficient number, since it is larger than the sum of its proper divisors (60910097).

126505503 is an equidigital number, since it uses as much as digits as its factorization.

126505503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4685398 (or 4685392 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 126505503 is about 11247.4665147312. The cubic root of 126505503 is about 501.9993320203. Note that the first 3 decimals are identical.

The spelling of 126505503 in words is "one hundred twenty-six million, five hundred five thousand, five hundred three".