1343999521 has 2 divisors, whose sum is σ = 1343999522. Its totient is φ = 1343999520.

The previous prime is 1343999491. The next prime is 1343999533. The reversal of 1343999521 is 1259993431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1299963025 + 44036496 = 36055^2 + 6636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1343999521 - 2¹⁵ = 1343966753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1343999551) 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, 671999760 + 671999761.

It is an arithmetic number, because the mean of its divisors is an integer number (671999761).

Almost surely, 2^1343999521 is an apocalyptic number.

It is an amenable number.

1343999521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1343999521 is an equidigital number, since it uses as much as digits as its factorization.

1343999521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 46.

The square root of 1343999521 is about 36660.5990267480. The cubic root of 1343999521 is about 1103.5695394488.

The spelling of 1343999521 in words is "one billion, three hundred forty-three million, nine hundred ninety-nine thousand, five hundred twenty-one".