126275521 has 4 divisors (see below), whose sum is σ = 128658132. Its totient is φ = 123892912.

The previous prime is 126275491. The next prime is 126275533. The reversal of 126275521 is 125572621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74995600 + 51279921 = 8660^2 + 7161^2 .

It is a cyclic number.

It is not a de Polignac number, because 126275521 - 2⁵ = 126275489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126275021) 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, 1191226 + ... + 1191331.

It is an arithmetic number, because the mean of its divisors is an integer number (32164533).

Almost surely, 2^126275521 is an apocalyptic number.

It is an amenable number.

126275521 is a deficient number, since it is larger than the sum of its proper divisors (2382611).

126275521 is an equidigital number, since it uses as much as digits as its factorization.

126275521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382610.

The product of its digits is 8400, while the sum is 31.

The square root of 126275521 is about 11237.2381393294. The cubic root of 126275521 is about 501.6949425140.

The spelling of 126275521 in words is "one hundred twenty-six million, two hundred seventy-five thousand, five hundred twenty-one".