126605321 has 4 divisors (see below), whose sum is σ = 128208000. Its totient is φ = 125002644.

The previous prime is 126605309. The next prime is 126605359. The reversal of 126605321 is 123506621.

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 a cyclic number.

It is not a de Polignac number, because 126605321 - 2⁶ = 126605257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126605371) 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, 801221 + ... + 801378.

It is an arithmetic number, because the mean of its divisors is an integer number (32052000).

Almost surely, 2^126605321 is an apocalyptic number.

It is an amenable number.

126605321 is a deficient number, since it is larger than the sum of its proper divisors (1602679).

126605321 is an equidigital number, since it uses as much as digits as its factorization.

126605321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602678.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 126605321 is about 11251.9029946050. The cubic root of 126605321 is about 502.1313299563.

The spelling of 126605321 in words is "one hundred twenty-six million, six hundred five thousand, three hundred twenty-one".