1318561 has 4 divisors (see below), whose sum is σ = 1330992. Its totient is φ = 1306132.

The previous prime is 1318553. The next prime is 1318579. The reversal of 1318561 is 1658131.

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 1318561 - 2³ = 1318553 is a prime.

It is a super-2 number, since 2×1318561² = 3477206221442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318661) 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, 6055 + ... + 6268.

It is an arithmetic number, because the mean of its divisors is an integer number (332748).

2^1318561 is an apocalyptic number.

It is an amenable number.

1318561 is a deficient number, since it is larger than the sum of its proper divisors (12431).

1318561 is a wasteful number, since it uses less digits than its factorization.

1318561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12430.

The product of its digits is 720, while the sum is 25.

The square root of 1318561 is about 1148.2861141719. The cubic root of 1318561 is about 109.6562547536.

The spelling of 1318561 in words is "one million, three hundred eighteen thousand, five hundred sixty-one".