1391161 has 16 divisors (see below), whose sum is σ = 1598400. Its totient is φ = 1202688.

The previous prime is 1391129. The next prime is 1391183. The reversal of 1391161 is 1611931.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1391161 - 2⁵ = 1391129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19021 + ... + 19093.

It is an arithmetic number, because the mean of its divisors is an integer number (99900).

2^1391161 is an apocalyptic number.

It is an amenable number.

1391161 is a deficient number, since it is larger than the sum of its proper divisors (207239).

1391161 is a wasteful number, since it uses less digits than its factorization.

1391161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168.

The product of its digits is 162, while the sum is 22.

The square root of 1391161 is about 1179.4748831578. The cubic root of 1391161 is about 111.6329662419.

The spelling of 1391161 in words is "one million, three hundred ninety-one thousand, one hundred sixty-one".