391161 has 8 divisors (see below), whose sum is σ = 544320. Its totient is φ = 249392.

The previous prime is 391159. The next prime is 391163. The reversal of 391161 is 161193.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (391159) and next prime (391163).

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 391161 - 2¹ = 391159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (391163) 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, 2766 + ... + 2903.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2³⁹¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

391161 is a deficient number, since it is larger than the sum of its proper divisors (153159).

391161 is a wasteful number, since it uses less digits than its factorization.

391161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5695.

The product of its digits is 162, while the sum is 21.

The square root of 391161 is about 625.4286530053. The cubic root of 391161 is about 73.1338633423.

The spelling of 391161 in words is "three hundred ninety-one thousand, one hundred sixty-one".