654421 has 2 divisors, whose sum is σ = 654422. Its totient is φ = 654420.

The previous prime is 654413. The next prime is 654427. The reversal of 654421 is 124456.

654421 is nontrivially palindromic in base 7.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 483025 + 171396 = 695^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 654421 - 2³ = 654413 is a prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 654392 and 654401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327210 + 327211.

It is an arithmetic number, because the mean of its divisors is an integer number (327211).

2⁶⁵⁴⁴²¹ is an apocalyptic number.

It is an amenable number.

654421 is a deficient number, since it is larger than the sum of its proper divisors (1).

654421 is an equidigital number, since it uses as much as digits as its factorization.

654421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 22.

The square root of 654421 is about 808.9629163318. The cubic root of 654421 is about 86.8198589062.

Adding to 654421 its reverse (124456), we get a palindrome (778877).

The spelling of 654421 in words is "six hundred fifty-four thousand, four hundred twenty-one".