126528321 has 4 divisors (see below), whose sum is σ = 168704432. Its totient is φ = 84352212.

The previous prime is 126528307. The next prime is 126528373. The reversal of 126528321 is 123825621.

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 126528321 - 2⁵ = 126528289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126528301) 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, 21088051 + ... + 21088056.

It is an arithmetic number, because the mean of its divisors is an integer number (42176108).

Almost surely, 2^126528321 is an apocalyptic number.

It is an amenable number.

126528321 is a deficient number, since it is larger than the sum of its proper divisors (42176111).

126528321 is an equidigital number, since it uses as much as digits as its factorization.

126528321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42176110.

The product of its digits is 5760, while the sum is 30.

The square root of 126528321 is about 11248.4808307611. The cubic root of 126528321 is about 502.0295123467.

The spelling of 126528321 in words is "one hundred twenty-six million, five hundred twenty-eight thousand, three hundred twenty-one".