1343020661 has 2 divisors, whose sum is σ = 1343020662. Its totient is φ = 1343020660.

The previous prime is 1343020649. The next prime is 1343020663. The reversal of 1343020661 is 1660203431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 980879761 + 362140900 = 31319^2 + 19030^2 .

It is a cyclic number.

It is not a de Polignac number, because 1343020661 - 2¹⁴ = 1343004277 is a prime.

Together with 1343020663, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1343020661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1343020663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 671510330 + 671510331.

It is an arithmetic number, because the mean of its divisors is an integer number (671510331).

Almost surely, 2^1343020661 is an apocalyptic number.

It is an amenable number.

1343020661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1343020661 is an equidigital number, since it uses as much as digits as its factorization.

1343020661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 1343020661 is about 36647.2462949128. The cubic root of 1343020661 is about 1103.3015575977.

The spelling of 1343020661 in words is "one billion, three hundred forty-three million, twenty thousand, six hundred sixty-one".