423151621 has 2 divisors, whose sum is σ = 423151622. Its totient is φ = 423151620.

The previous prime is 423151601. The next prime is 423151627. The reversal of 423151621 is 126151324.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 422754721 + 396900 = 20561^2 + 630^2 .

It is a cyclic number.

It is not a de Polignac number, because 423151621 - 2¹⁵ = 423118853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423151627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211575810 + 211575811.

It is an arithmetic number, because the mean of its divisors is an integer number (211575811).

Almost surely, 2^423151621 is an apocalyptic number.

It is an amenable number.

423151621 is a deficient number, since it is larger than the sum of its proper divisors (1).

423151621 is an equidigital number, since it uses as much as digits as its factorization.

423151621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 423151621 is about 20570.6495036010. The cubic root of 423151621 is about 750.7557543395.

The spelling of 423151621 in words is "four hundred twenty-three million, one hundred fifty-one thousand, six hundred twenty-one".