1321452643 has 16 divisors (see below), whose sum is σ = 1539578880. Its totient is φ = 1110839616.

The previous prime is 1321452607. The next prime is 1321452647. The reversal of 1321452643 is 3462541231.

It is a cyclic number.

It is not a de Polignac number, because 1321452643 - 2⁹ = 1321452131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321452647) 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, 84246 + ... + 98692.

It is an arithmetic number, because the mean of its divisors is an integer number (96223680).

Almost surely, 2^1321452643 is an apocalyptic number.

1321452643 is a deficient number, since it is larger than the sum of its proper divisors (218126237).

1321452643 is a wasteful number, since it uses less digits than its factorization.

1321452643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14706.

The product of its digits is 17280, while the sum is 31.

The square root of 1321452643 is about 36351.7900934741. The cubic root of 1321452643 is about 1097.3635602306.

Adding to 1321452643 its reverse (3462541231), we get a palindrome (4783993874).

It can be divided in two parts, 132145 and 2643, that multiplied together give a triangular number (349259235 = T₂₆₄₂₉).

The spelling of 1321452643 in words is "one billion, three hundred twenty-one million, four hundred fifty-two thousand, six hundred forty-three".