1323920681 has 4 divisors (see below), whose sum is σ = 1327714500. Its totient is φ = 1320126864.

The previous prime is 1323920671. The next prime is 1323920683. The reversal of 1323920681 is 1860293231.

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 471280681 + 852640000 = 21709^2 + 29200^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323920681 - 2⁶ = 1323920617 is a prime.

It is a super-2 number, since 2×1323920681² = 3505531939159007522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1323920683) 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 in 3 ways as a sum of consecutive naturals, for example, 1896386 + ... + 1897083.

It is an arithmetic number, because the mean of its divisors is an integer number (331928625).

Almost surely, 2^1323920681 is an apocalyptic number.

It is an amenable number.

1323920681 is a deficient number, since it is larger than the sum of its proper divisors (3793819).

1323920681 is an equidigital number, since it uses as much as digits as its factorization.

1323920681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3793818.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 1323920681 is about 36385.7208393622. The cubic root of 1323920681 is about 1098.0463065088.

The spelling of 1323920681 in words is "one billion, three hundred twenty-three million, nine hundred twenty thousand, six hundred eighty-one".