349428661 has 4 divisors (see below), whose sum is σ = 349699372. Its totient is φ = 349157952.

The previous prime is 349428631. The next prime is 349428697. The reversal of 349428661 is 166824943.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 346518225 + 2910436 = 18615^2 + 1706^2 .

It is a cyclic number.

It is not a de Polignac number, because 349428661 - 2⁷ = 349428533 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 (349428631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133410 + ... + 136003.

It is an arithmetic number, because the mean of its divisors is an integer number (87424843).

Almost surely, 2^349428661 is an apocalyptic number.

It is an amenable number.

349428661 is a deficient number, since it is larger than the sum of its proper divisors (270711).

349428661 is a wasteful number, since it uses less digits than its factorization.

349428661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270710.

The product of its digits is 248832, while the sum is 43.

The square root of 349428661 is about 18693.0110201647. The cubic root of 349428661 is about 704.3461980168.

The spelling of 349428661 in words is "three hundred forty-nine million, four hundred twenty-eight thousand, six hundred sixty-one".