654255221 has 2 divisors, whose sum is σ = 654255222. Its totient is φ = 654255220.

The previous prime is 654255179. The next prime is 654255223. The reversal of 654255221 is 122552456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 558802321 + 95452900 = 23639^2 + 9770^2 .

It is a cyclic number.

It is not a de Polignac number, because 654255221 - 2⁶ = 654255157 is a prime.

Together with 654255223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654255223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327127610 + 327127611.

It is an arithmetic number, because the mean of its divisors is an integer number (327127611).

Almost surely, 2^654255221 is an apocalyptic number.

It is an amenable number.

654255221 is a deficient number, since it is larger than the sum of its proper divisors (1).

654255221 is an equidigital number, since it uses as much as digits as its factorization.

654255221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 32.

The square root of 654255221 is about 25578.4131837767. The cubic root of 654255221 is about 868.1252717078.

The spelling of 654255221 in words is "six hundred fifty-four million, two hundred fifty-five thousand, two hundred twenty-one".