126505 has 4 divisors (see below), whose sum is σ = 151812. Its totient is φ = 101200.

The previous prime is 126499. The next prime is 126517. The reversal of 126505 is 505621.

126505 = 251² + 252².

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505621 = 421 ⋅1201.

It can be written as a sum of positive squares in 2 ways, for example, as 63504 + 63001 = 252^2 + 251^2 .

It is not a de Polignac number, because 126505 - 2⁵ = 126473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12646 + ... + 12655.

It is an arithmetic number, because the mean of its divisors is an integer number (37953).

2¹²⁶⁵⁰⁵ is an apocalyptic number.

126505 is the 252-nd centered square number.

It is an amenable number.

126505 is a deficient number, since it is larger than the sum of its proper divisors (25307).

126505 is an equidigital number, since it uses as much as digits as its factorization.

126505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25306.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 126505 is about 355.6754138256. The cubic root of 126505 is about 50.1998666684.

The spelling of 126505 in words is "one hundred twenty-six thousand, five hundred five".