391104661 has 8 divisors (see below), whose sum is σ = 397876160. Its totient is φ = 384360768.

The previous prime is 391104641. The next prime is 391104671. The reversal of 391104661 is 166401193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 391104661 - 2⁵ = 391104629 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 (391104631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22765 + ... + 36061.

It is an arithmetic number, because the mean of its divisors is an integer number (49734520).

Almost surely, 2^391104661 is an apocalyptic number.

It is an amenable number.

391104661 is a deficient number, since it is larger than the sum of its proper divisors (6771499).

391104661 is a wasteful number, since it uses less digits than its factorization.

391104661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13803.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 391104661 is about 19776.3662233485. The cubic root of 391104661 is about 731.3035201191.

The spelling of 391104661 in words is "three hundred ninety-one million, one hundred four thousand, six hundred sixty-one".