1391155 has 8 divisors (see below), whose sum is σ = 1742112. Its totient is φ = 1064448.

The previous prime is 1391129. The next prime is 1391183. The reversal of 1391155 is 5511931.

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 1391155 - 2⁹ = 1390643 is a prime.

1391155 is a lucky number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5934 + ... + 6163.

It is an arithmetic number, because the mean of its divisors is an integer number (217764).

2^1391155 is an apocalyptic number.

1391155 is a deficient number, since it is larger than the sum of its proper divisors (350957).

1391155 is a wasteful number, since it uses less digits than its factorization.

1391155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12125.

The product of its digits is 675, while the sum is 25.

The square root of 1391155 is about 1179.4723396502. The cubic root of 1391155 is about 111.6328057527.

The spelling of 1391155 in words is "one million, three hundred ninety-one thousand, one hundred fifty-five".