1310561 has 4 divisors (see below), whose sum is σ = 1497792. Its totient is φ = 1123332.

The previous prime is 1310549. The next prime is 1310579. The reversal of 1310561 is 1650131.

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.

It is not a de Polignac number, because 1310561 - 2¹⁴ = 1294177 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310591) 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, 93605 + ... + 93618.

It is an arithmetic number, because the mean of its divisors is an integer number (374448).

2^1310561 is an apocalyptic number.

It is an amenable number.

1310561 is a deficient number, since it is larger than the sum of its proper divisors (187231).

1310561 is an equidigital number, since it uses as much as digits as its factorization.

1310561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187230.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1310561 is about 1144.7973619816. The cubic root of 1310561 is about 109.4340351776.

Adding to 1310561 its reverse (1650131), we get a palindrome (2960692).

The spelling of 1310561 in words is "one million, three hundred ten thousand, five hundred sixty-one".