1391105 has 8 divisors (see below), whose sum is σ = 1697064. Its totient is φ = 1094400.

The previous prime is 1391087. The next prime is 1391113. The reversal of 1391105 is 5011931.

It can be written as a sum of positive squares in 4 ways, for example, as 5776 + 1385329 = 76^2 + 1177^2 .

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

It is not a de Polignac number, because 1391105 - 2⁶ = 1391041 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1976 + ... + 2585.

It is an arithmetic number, because the mean of its divisors is an integer number (212133).

2^1391105 is an apocalyptic number.

It is an amenable number.

1391105 is a deficient number, since it is larger than the sum of its proper divisors (305959).

1391105 is an equidigital number, since it uses as much as digits as its factorization.

1391105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4627.

The product of its (nonzero) digits is 135, while the sum is 20.

The square root of 1391105 is about 1179.4511435409. The cubic root of 1391105 is about 111.6314683252.

The spelling of 1391105 in words is "one million, three hundred ninety-one thousand, one hundred five".