1367488781 has 2 divisors, whose sum is σ = 1367488782. Its totient is φ = 1367488780.

The previous prime is 1367488777. The next prime is 1367488819. The reversal of 1367488781 is 1878847631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1152602500 + 214886281 = 33950^2 + 14659^2 .

It is an emirp because it is prime and its reverse (1878847631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1367488781 - 2² = 1367488777 is a prime.

It is a super-2 number, since 2×1367488781² = 3740051132321731922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1367488711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683744390 + 683744391.

It is an arithmetic number, because the mean of its divisors is an integer number (683744391).

Almost surely, 2^1367488781 is an apocalyptic number.

It is an amenable number.

1367488781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1367488781 is an equidigital number, since it uses as much as digits as its factorization.

1367488781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1806336, while the sum is 53.

The square root of 1367488781 is about 36979.5724826559. The cubic root of 1367488781 is about 1109.9615226226.

The spelling of 1367488781 in words is "one billion, three hundred sixty-seven million, four hundred eighty-eight thousand, seven hundred eighty-one".