1320531 has 4 divisors (see below), whose sum is σ = 1760712. Its totient is φ = 880352.

The previous prime is 1320437. The next prime is 1320533. The reversal of 1320531 is 1350231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1350231 = 3 ⋅450077.

It is a cyclic number.

It is not a de Polignac number, because 1320531 - 2⁹ = 1320019 is a prime.

It is a super-2 number, since 2×1320531² = 3487604243922, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320531.

It is not an unprimeable number, because it can be changed into a prime (1320533) 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, 220086 + ... + 220091.

It is an arithmetic number, because the mean of its divisors is an integer number (440178).

2^1320531 is an apocalyptic number.

1320531 is a deficient number, since it is larger than the sum of its proper divisors (440181).

1320531 is an equidigital number, since it uses as much as digits as its factorization.

1320531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440180.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 1320531 is about 1149.1435941605. The cubic root of 1320531 is about 109.7108383307.

Adding to 1320531 its reverse (1350231), we get a palindrome (2670762).

The spelling of 1320531 in words is "one million, three hundred twenty thousand, five hundred thirty-one".