783138869 has 2 divisors, whose sum is σ = 783138870. Its totient is φ = 783138868.

The previous prime is 783138821. The next prime is 783138871. The reversal of 783138869 is 968831387.

783138869 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., 749938225 + 33200644 = 27385^2 + 5762^2 .

It is a cyclic number.

It is not a de Polignac number, because 783138869 - 2²⁴ = 766361653 is a prime.

It is a super-2 number, since 2×783138869² = 1226612976277198322, which contains 22 as substring.

Together with 783138871, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 783138869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (783138809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391569434 + 391569435.

It is an arithmetic number, because the mean of its divisors is an integer number (391569435).

Almost surely, 2^783138869 is an apocalyptic number.

It is an amenable number.

783138869 is a deficient number, since it is larger than the sum of its proper divisors (1).

783138869 is an equidigital number, since it uses as much as digits as its factorization.

783138869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The square root of 783138869 is about 27984.6184358479. The cubic root of 783138869 is about 921.7495335736.

The spelling of 783138869 in words is "seven hundred eighty-three million, one hundred thirty-eight thousand, eight hundred sixty-nine".