1343682721 has 2 divisors, whose sum is σ = 1343682722. Its totient is φ = 1343682720.

The previous prime is 1343682719. The next prime is 1343682761. The reversal of 1343682721 is 1272863431.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679332096 + 664350625 = 26064^2 + 25775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1343682721 - 2¹ = 1343682719 is a prime.

Together with 1343682719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1343682761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 671841360 + 671841361.

It is an arithmetic number, because the mean of its divisors is an integer number (671841361).

Almost surely, 2^1343682721 is an apocalyptic number.

It is an amenable number.

1343682721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1343682721 is an equidigital number, since it uses as much as digits as its factorization.

1343682721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 1343682721 is about 36656.2780571078. The cubic root of 1343682721 is about 1103.4828235689.

The spelling of 1343682721 in words is "one billion, three hundred forty-three million, six hundred eighty-two thousand, seven hundred twenty-one".