1291017 has 16 divisors (see below), whose sum is σ = 2119040. Its totient is φ = 680832.

The previous prime is 1291009. The next prime is 1291019. The reversal of 1291017 is 7101921.

It is not a de Polignac number, because 1291017 - 2³ = 1291009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1290984 and 1291002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2092 + ... + 2637.

It is an arithmetic number, because the mean of its divisors is an integer number (132440).

2^1291017 is an apocalyptic number.

It is an amenable number.

1291017 is a deficient number, since it is larger than the sum of its proper divisors (828023).

1291017 is a wasteful number, since it uses less digits than its factorization.

1291017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4752.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 1291017 is about 1136.2292902403. The cubic root of 1291017 is about 108.8873228908.

Adding to 1291017 its reverse (7101921), we get a palindrome (8392938).

The spelling of 1291017 in words is "one million, two hundred ninety-one thousand, seventeen".