1348287781 has 2 divisors, whose sum is σ = 1348287782. Its totient is φ = 1348287780.

The previous prime is 1348287779. The next prime is 1348287793. The reversal of 1348287781 is 1877828431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 957593025 + 390694756 = 30945^2 + 19766^2 .

It is an emirp because it is prime and its reverse (1877828431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1348287781 - 2¹ = 1348287779 is a prime.

It is a super-2 number, since 2×1348287781² = 3635759880787807922, which contains 22 as substring.

Together with 1348287779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1348287701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 674143890 + 674143891.

It is an arithmetic number, because the mean of its divisors is an integer number (674143891).

Almost surely, 2^1348287781 is an apocalyptic number.

It is an amenable number.

1348287781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1348287781 is an equidigital number, since it uses as much as digits as its factorization.

1348287781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 602112, while the sum is 49.

The square root of 1348287781 is about 36719.0383997185. The cubic root of 1348287781 is about 1104.7420023782.

The spelling of 1348287781 in words is "one billion, three hundred forty-eight million, two hundred eighty-seven thousand, seven hundred eighty-one".