1391617 has 4 divisors (see below), whose sum is σ = 1464880. Its totient is φ = 1318356.

The previous prime is 1391597. The next prime is 1391627. The reversal of 1391617 is 7161931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7161931 = 7 ⋅1023133.

It is a cyclic number.

It is not a de Polignac number, because 1391617 - 2¹¹ = 1389569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36603 + ... + 36640.

It is an arithmetic number, because the mean of its divisors is an integer number (366220).

2^1391617 is an apocalyptic number.

It is an amenable number.

1391617 is a deficient number, since it is larger than the sum of its proper divisors (73263).

1391617 is an equidigital number, since it uses as much as digits as its factorization.

1391617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73262.

The product of its digits is 1134, while the sum is 28.

The square root of 1391617 is about 1179.6681736828. The cubic root of 1391617 is about 111.6451620677.

The spelling of 1391617 in words is "one million, three hundred ninety-one thousand, six hundred seventeen".