1317561 has 12 divisors (see below), whose sum is σ = 2043792. Its totient is φ = 752808.

The previous prime is 1317553. The next prime is 1317571. The reversal of 1317561 is 1657131.

It is not a de Polignac number, because 1317561 - 2³ = 1317553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1317521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4335 + ... + 4628.

It is an arithmetic number, because the mean of its divisors is an integer number (170316).

2^1317561 is an apocalyptic number.

It is an amenable number.

1317561 is a deficient number, since it is larger than the sum of its proper divisors (726231).

1317561 is an equidigital number, since it uses as much as digits as its factorization.

1317561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8980 (or 8973 counting only the distinct ones).

The product of its digits is 630, while the sum is 24.

The square root of 1317561 is about 1147.8506000347. The cubic root of 1317561 is about 109.6285265490.

It can be divided in two parts, 1317 and 561, that multiplied together give a palindrome (738837).

The spelling of 1317561 in words is "one million, three hundred seventeen thousand, five hundred sixty-one".