423312521 has 2 divisors, whose sum is σ = 423312522. Its totient is φ = 423312520.

The previous prime is 423312517. The next prime is 423312541. The reversal of 423312521 is 125213324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 416364025 + 6948496 = 20405^2 + 2636^2 .

It is a cyclic number.

It is not a de Polignac number, because 423312521 - 2² = 423312517 is a prime.

It is not a weakly prime, because it can be changed into another prime (423312541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211656260 + 211656261.

It is an arithmetic number, because the mean of its divisors is an integer number (211656261).

Almost surely, 2^423312521 is an apocalyptic number.

It is an amenable number.

423312521 is a deficient number, since it is larger than the sum of its proper divisors (1).

423312521 is an equidigital number, since it uses as much as digits as its factorization.

423312521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 23.

The square root of 423312521 is about 20574.5600438989. The cubic root of 423312521 is about 750.8508985601.

Adding to 423312521 its reverse (125213324), we get a palindrome (548525845).

The spelling of 423312521 in words is "four hundred twenty-three million, three hundred twelve thousand, five hundred twenty-one".