781349069 has 2 divisors, whose sum is σ = 781349070. Its totient is φ = 781349068.

The previous prime is 781349033. The next prime is 781349071. The reversal of 781349069 is 960943187.

781349069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 690375625 + 90973444 = 26275^2 + 9538^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-781349069 is a prime.

It is a super-2 number, since 2×781349069² = 1221012735254333522, which contains 22 as substring.

Together with 781349071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781349089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390674534 + 390674535.

It is an arithmetic number, because the mean of its divisors is an integer number (390674535).

Almost surely, 2^781349069 is an apocalyptic number.

It is an amenable number.

781349069 is a deficient number, since it is larger than the sum of its proper divisors (1).

781349069 is an equidigital number, since it uses as much as digits as its factorization.

781349069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 781349069 is about 27952.6218627162. The cubic root of 781349069 is about 921.0468035017.

The spelling of 781349069 in words is "seven hundred eighty-one million, three hundred forty-nine thousand, sixty-nine".