349697221 has 4 divisors (see below), whose sum is σ = 364901472. Its totient is φ = 334492972.

The previous prime is 349697219. The next prime is 349697239. The reversal of 349697221 is 122796943.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122796943 = 19 ⋅6462997.

It is a cyclic number.

It is not a de Polignac number, because 349697221 - 2¹ = 349697219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349697251) 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 in 3 ways as a sum of consecutive naturals, for example, 7602091 + ... + 7602136.

It is an arithmetic number, because the mean of its divisors is an integer number (91225368).

Almost surely, 2^349697221 is an apocalyptic number.

It is an amenable number.

349697221 is a deficient number, since it is larger than the sum of its proper divisors (15204251).

349697221 is a wasteful number, since it uses less digits than its factorization.

349697221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15204250.

The product of its digits is 163296, while the sum is 43.

The square root of 349697221 is about 18700.1930738696. The cubic root of 349697221 is about 704.5265980012.

The spelling of 349697221 in words is "three hundred forty-nine million, six hundred ninety-seven thousand, two hundred twenty-one".