1309617 has 6 divisors (see below), whose sum is σ = 1891682. Its totient is φ = 873072.

The previous prime is 1309601. The next prime is 1309631. The reversal of 1309617 is 7169031.

It can be written as a sum of positive squares in only one way, i.e., 1115136 + 194481 = 1056^2 + 441^2 .

It is not a de Polignac number, because 1309617 - 2⁴ = 1309601 is a prime.

It is a Duffinian number.

1309617 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1309117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72748 + ... + 72765.

2^1309617 is an apocalyptic number.

It is an amenable number.

1309617 is a deficient number, since it is larger than the sum of its proper divisors (582065).

1309617 is a wasteful number, since it uses less digits than its factorization.

1309617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145519 (or 145516 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 1309617 is about 1144.3849876680. The cubic root of 1309617 is about 109.4077536735.

The spelling of 1309617 in words is "one million, three hundred nine thousand, six hundred seventeen".