69340781 has 2 divisors, whose sum is σ = 69340782. Its totient is φ = 69340780.

The previous prime is 69340771. The next prime is 69340793. The reversal of 69340781 is 18704396.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60310756 + 9030025 = 7766^2 + 3005^2 .

It is a cyclic number.

It is not a de Polignac number, because 69340781 - 2¹⁰ = 69339757 is a prime.

It is a super-2 number, since 2×69340781² = 9616287819379922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69340771) 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, 34670390 + 34670391.

It is an arithmetic number, because the mean of its divisors is an integer number (34670391).

Almost surely, 2^69340781 is an apocalyptic number.

It is an amenable number.

69340781 is a deficient number, since it is larger than the sum of its proper divisors (1).

69340781 is an equidigital number, since it uses as much as digits as its factorization.

69340781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 69340781 is about 8327.1112037729. Note that the first 3 decimals coincide. The cubic root of 69340781 is about 410.8307190382.

The spelling of 69340781 in words is "sixty-nine million, three hundred forty thousand, seven hundred eighty-one".