1313561 has 4 divisors (see below), whose sum is σ = 1324032. Its totient is φ = 1303092.

The previous prime is 1313467. The next prime is 1313567. The reversal of 1313561 is 1653131.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 1313561 - 2¹⁸ = 1051417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1313567) 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, 5045 + ... + 5298.

It is an arithmetic number, because the mean of its divisors is an integer number (331008).

2^1313561 is an apocalyptic number.

It is an amenable number.

1313561 is a deficient number, since it is larger than the sum of its proper divisors (10471).

1313561 is a wasteful number, since it uses less digits than its factorization.

1313561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10470.

The product of its digits is 270, while the sum is 20.

The square root of 1313561 is about 1146.1068885580. The cubic root of 1313561 is about 109.5174732164.

Adding to 1313561 its reverse (1653131), we get a palindrome (2966692).

The spelling of 1313561 in words is "one million, three hundred thirteen thousand, five hundred sixty-one".