670617221 has 2 divisors, whose sum is σ = 670617222. Its totient is φ = 670617220.

The previous prime is 670617209. The next prime is 670617229. The reversal of 670617221 is 122716076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 572884225 + 97732996 = 23935^2 + 9886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670617221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670617229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335308610 + 335308611.

It is an arithmetic number, because the mean of its divisors is an integer number (335308611).

Almost surely, 2^670617221 is an apocalyptic number.

It is an amenable number.

670617221 is a deficient number, since it is larger than the sum of its proper divisors (1).

670617221 is an equidigital number, since it uses as much as digits as its factorization.

670617221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 670617221 is about 25896.2781302642. The cubic root of 670617221 is about 875.3026309922.

The spelling of 670617221 in words is "six hundred seventy million, six hundred seventeen thousand, two hundred twenty-one".