1321245545 has 4 divisors (see below), whose sum is σ = 1585494660. Its totient is φ = 1056996432.

The previous prime is 1321245517. The next prime is 1321245547. The reversal of 1321245545 is 5455421231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 283181584 + 1038063961 = 16828^2 + 32219^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321245545 - 2¹⁸ = 1320983401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321245547) 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, 132124550 + ... + 132124559.

It is an arithmetic number, because the mean of its divisors is an integer number (396373665).

Almost surely, 2^1321245545 is an apocalyptic number.

It is an amenable number.

1321245545 is a deficient number, since it is larger than the sum of its proper divisors (264249115).

1321245545 is an equidigital number, since it uses as much as digits as its factorization.

1321245545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264249114.

The product of its digits is 24000, while the sum is 32.

The square root of 1321245545 is about 36348.9414563891. The cubic root of 1321245545 is about 1097.3062309793.

Adding to 1321245545 its reverse (5455421231), we get a palindrome (6776666776).

The spelling of 1321245545 in words is "one billion, three hundred twenty-one million, two hundred forty-five thousand, five hundred forty-five".