17949221 has 2 divisors, whose sum is σ = 17949222. Its totient is φ = 17949220.

The previous prime is 17949199. The next prime is 17949241. The reversal of 17949221 is 12294971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 98596 = 4225^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 17949221 - 2¹⁰ = 17948197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17949241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8974610 + 8974611.

It is an arithmetic number, because the mean of its divisors is an integer number (8974611).

Almost surely, 2^17949221 is an apocalyptic number.

It is an amenable number.

17949221 is a deficient number, since it is larger than the sum of its proper divisors (1).

17949221 is an equidigital number, since it uses as much as digits as its factorization.

17949221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 17949221 is about 4236.6520980604. The cubic root of 17949221 is about 261.8274654126.

The spelling of 17949221 in words is "seventeen million, nine hundred forty-nine thousand, two hundred twenty-one".