670950221 has 2 divisors, whose sum is σ = 670950222. Its totient is φ = 670950220.

The previous prime is 670950209. The next prime is 670950223. The reversal of 670950221 is 122059076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 358155625 + 312794596 = 18925^2 + 17686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670950221 is a prime.

Together with 670950223, 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 (670950223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335475110 + 335475111.

It is an arithmetic number, because the mean of its divisors is an integer number (335475111).

Almost surely, 2^670950221 is an apocalyptic number.

It is an amenable number.

670950221 is a deficient number, since it is larger than the sum of its proper divisors (1).

670950221 is an equidigital number, since it uses as much as digits as its factorization.

670950221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 670950221 is about 25902.7068276657. The cubic root of 670950221 is about 875.4474863759.

The spelling of 670950221 in words is "six hundred seventy million, nine hundred fifty thousand, two hundred twenty-one".