349556691 has 32 divisors (see below), whose sum is σ = 548881920. Its totient is φ = 195641600.

The previous prime is 349556689. The next prime is 349556729. The reversal of 349556691 is 196655943.

It is a happy number.

It is not a de Polignac number, because 349556691 - 2¹ = 349556689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 349556691.

It is not an unprimeable number, because it can be changed into a prime (349556491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14071 + ... + 29951.

It is an arithmetic number, because the mean of its divisors is an integer number (17152560).

Almost surely, 2^349556691 is an apocalyptic number.

349556691 is a deficient number, since it is larger than the sum of its proper divisors (199325229).

349556691 is a wasteful number, since it uses less digits than its factorization.

349556691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15947.

The product of its digits is 874800, while the sum is 48.

The square root of 349556691 is about 18696.4352484638. The cubic root of 349556691 is about 704.4322112172.

It can be divided in two parts, 349 and 556691, that added together give a triangular number (557040 = T₁₀₅₅).

The spelling of 349556691 in words is "three hundred forty-nine million, five hundred fifty-six thousand, six hundred ninety-one".