349233721 has 2 divisors, whose sum is σ = 349233722. Its totient is φ = 349233720.

The previous prime is 349233701. The next prime is 349233739. The reversal of 349233721 is 127332943.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 347636025 + 1597696 = 18645^2 + 1264^2 .

It is an emirp because it is prime and its reverse (127332943) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 349233721 - 2¹⁹ = 348709433 is a prime.

It is not a weakly prime, because it can be changed into another prime (349233701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174616860 + 174616861.

It is an arithmetic number, because the mean of its divisors is an integer number (174616861).

Almost surely, 2^349233721 is an apocalyptic number.

It is an amenable number.

349233721 is a deficient number, since it is larger than the sum of its proper divisors (1).

349233721 is an equidigital number, since it uses as much as digits as its factorization.

349233721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 34.

The square root of 349233721 is about 18687.7960444778. The cubic root of 349233721 is about 704.2151929367.

The spelling of 349233721 in words is "three hundred forty-nine million, two hundred thirty-three thousand, seven hundred twenty-one".