353690221 has 2 divisors, whose sum is σ = 353690222. Its totient is φ = 353690220.

The previous prime is 353690213. The next prime is 353690243. The reversal of 353690221 is 122096353.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346480996 + 7209225 = 18614^2 + 2685^2 .

It is an emirp because it is prime and its reverse (122096353) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 353690221 - 2³ = 353690213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (353690291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 176845110 + 176845111.

It is an arithmetic number, because the mean of its divisors is an integer number (176845111).

Almost surely, 2^353690221 is an apocalyptic number.

It is an amenable number.

353690221 is a deficient number, since it is larger than the sum of its proper divisors (1).

353690221 is an equidigital number, since it uses as much as digits as its factorization.

353690221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 353690221 is about 18806.6536364128. The cubic root of 353690221 is about 707.1979896924.

The spelling of 353690221 in words is "three hundred fifty-three million, six hundred ninety thousand, two hundred twenty-one".