654603421 has 2 divisors, whose sum is σ = 654603422. Its totient is φ = 654603420.

The previous prime is 654603379. The next prime is 654603449. The reversal of 654603421 is 124306456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 645871396 + 8732025 = 25414^2 + 2955^2 .

It is a cyclic number.

It is not a de Polignac number, because 654603421 - 2⁷ = 654603293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654603461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327301710 + 327301711.

It is an arithmetic number, because the mean of its divisors is an integer number (327301711).

Almost surely, 2^654603421 is an apocalyptic number.

It is an amenable number.

654603421 is a deficient number, since it is larger than the sum of its proper divisors (1).

654603421 is an equidigital number, since it uses as much as digits as its factorization.

654603421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 654603421 is about 25585.2187991426. The cubic root of 654603421 is about 868.2792521934.

Adding to 654603421 its reverse (124306456), we get a palindrome (778909877).

The spelling of 654603421 in words is "six hundred fifty-four million, six hundred three thousand, four hundred twenty-one".