423500621 has 2 divisors, whose sum is σ = 423500622. Its totient is φ = 423500620.

The previous prime is 423500531. The next prime is 423500639. The reversal of 423500621 is 126005324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 392475721 + 31024900 = 19811^2 + 5570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423500621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423503621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211750310 + 211750311.

It is an arithmetic number, because the mean of its divisors is an integer number (211750311).

Almost surely, 2^423500621 is an apocalyptic number.

It is an amenable number.

423500621 is a deficient number, since it is larger than the sum of its proper divisors (1).

423500621 is an equidigital number, since it uses as much as digits as its factorization.

423500621 is an evil number, because the sum of its binary digits is even.

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

The square root of 423500621 is about 20579.1307153631. The cubic root of 423500621 is about 750.9620962629.

Adding to 423500621 its reverse (126005324), we get a palindrome (549505945).

The spelling of 423500621 in words is "four hundred twenty-three million, five hundred thousand, six hundred twenty-one".