1336781 has 2 divisors, whose sum is σ = 1336782. Its totient is φ = 1336780.

The previous prime is 1336747. The next prime is 1336793. The reversal of 1336781 is 1876331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 902500 + 434281 = 950^2 + 659^2 .

It is an emirp because it is prime and its reverse (1876331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1336781 is a prime.

It is a super-2 number, since 2×1336781² = 3573966883922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1336481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 668390 + 668391.

It is an arithmetic number, because the mean of its divisors is an integer number (668391).

2^1336781 is an apocalyptic number.

It is an amenable number.

1336781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1336781 is an equidigital number, since it uses as much as digits as its factorization.

1336781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 1336781 is about 1156.1924580276. The cubic root of 1336781 is about 110.1590261846.

The spelling of 1336781 in words is "one million, three hundred thirty-six thousand, seven hundred eighty-one".