1346718781 has 2 divisors, whose sum is σ = 1346718782. Its totient is φ = 1346718780.

The previous prime is 1346718773. The next prime is 1346718787. The reversal of 1346718781 is 1878176431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 893412100 + 453306681 = 29890^2 + 21291^2 .

It is a cyclic number.

It is not a de Polignac number, because 1346718781 - 2³ = 1346718773 is a prime.

It is a super-2 number, since 2×1346718781² = 3627302950196251922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1346718787) 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, 673359390 + 673359391.

It is an arithmetic number, because the mean of its divisors is an integer number (673359391).

Almost surely, 2^1346718781 is an apocalyptic number.

It is an amenable number.

1346718781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1346718781 is an equidigital number, since it uses as much as digits as its factorization.

1346718781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 46.

The square root of 1346718781 is about 36697.6672419379. The cubic root of 1346718781 is about 1104.3133073022.

The spelling of 1346718781 in words is "one billion, three hundred forty-six million, seven hundred eighteen thousand, seven hundred eighty-one".