1313581 has 4 divisors (see below), whose sum is σ = 1317600. Its totient is φ = 1309564.

The previous prime is 1313579. The next prime is 1313597. The reversal of 1313581 is 1853131.

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 1313581 - 2¹ = 1313579 is a prime.

It is a super-2 number, since 2×1313581² = 3450990087122, which contains 22 as substring.

It is a Duffinian number.

1313581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313881) 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, 1471 + ... + 2188.

It is an arithmetic number, because the mean of its divisors is an integer number (329400).

2^1313581 is an apocalyptic number.

It is an amenable number.

1313581 is a deficient number, since it is larger than the sum of its proper divisors (4019).

1313581 is an equidigital number, since it uses as much as digits as its factorization.

1313581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4018.

The product of its digits is 360, while the sum is 22.

The square root of 1313581 is about 1146.1156137144. The cubic root of 1313581 is about 109.5180290435.

The spelling of 1313581 in words is "one million, three hundred thirteen thousand, five hundred eighty-one".