1321545 has 16 divisors (see below), whose sum is σ = 2226240. Its totient is φ = 667584.

The previous prime is 1321517. The next prime is 1321549. The reversal of 1321545 is 5451231.

It is not a de Polignac number, because 1321545 - 2⁵ = 1321513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2034 + ... + 2603.

It is an arithmetic number, because the mean of its divisors is an integer number (139140).

2^1321545 is an apocalyptic number.

1321545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321545 is a deficient number, since it is larger than the sum of its proper divisors (904695).

1321545 is a wasteful number, since it uses less digits than its factorization.

1321545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4664.

The product of its digits is 600, while the sum is 21.

The square root of 1321545 is about 1149.5847076227. The cubic root of 1321545 is about 109.7389124735.

Adding to 1321545 its reverse (5451231), we get a palindrome (6772776).

The spelling of 1321545 in words is "one million, three hundred twenty-one thousand, five hundred forty-five".