1321505 has 4 divisors (see below), whose sum is σ = 1585812. Its totient is φ = 1057200.

The previous prime is 1321487. The next prime is 1321513. The reversal of 1321505 is 5051231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5051231 = 47 ⋅107473.

It can be written as a sum of positive squares in 2 ways, for example, as 355216 + 966289 = 596^2 + 983^2 .

It is not a de Polignac number, because 1321505 - 2⁸ = 1321249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132146 + ... + 132155.

It is an arithmetic number, because the mean of its divisors is an integer number (396453).

2^1321505 is an apocalyptic number.

It is an amenable number.

1321505 is a deficient number, since it is larger than the sum of its proper divisors (264307).

1321505 is an equidigital number, since it uses as much as digits as its factorization.

1321505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264306.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1321505 is about 1149.5673099040. The cubic root of 1321505 is about 109.7378052844.

Adding to 1321505 its reverse (5051231), we get a palindrome (6372736).

The spelling of 1321505 in words is "one million, three hundred twenty-one thousand, five hundred five".