1320972643 has 2 divisors, whose sum is σ = 1320972644. Its totient is φ = 1320972642.

The previous prime is 1320972623. The next prime is 1320972671. The reversal of 1320972643 is 3462790231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1320972643 - 2²¹ = 1318875491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320972623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660486321 + 660486322.

It is an arithmetic number, because the mean of its divisors is an integer number (660486322).

Almost surely, 2^1320972643 is an apocalyptic number.

1320972643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320972643 is an equidigital number, since it uses as much as digits as its factorization.

1320972643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 1320972643 is about 36345.1873430307. The cubic root of 1320972643 is about 1097.2306765940.

The spelling of 1320972643 in words is "one billion, three hundred twenty million, nine hundred seventy-two thousand, six hundred forty-three".