779687969 has 2 divisors, whose sum is σ = 779687970. Its totient is φ = 779687968.

The previous prime is 779687899. The next prime is 779687977. The reversal of 779687969 is 969786977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 652291600 + 127396369 = 25540^2 + 11287^2 .

It is an emirp because it is prime and its reverse (969786977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 779687969 - 2¹⁶ = 779622433 is a prime.

It is a super-2 number, since 2×779687969² = 1215826658006689922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 779687899 and 779687908.

It is not a weakly prime, because it can be changed into another prime (779647969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389843984 + 389843985.

It is an arithmetic number, because the mean of its divisors is an integer number (389843985).

Almost surely, 2^779687969 is an apocalyptic number.

It is an amenable number.

779687969 is a deficient number, since it is larger than the sum of its proper divisors (1).

779687969 is an equidigital number, since it uses as much as digits as its factorization.

779687969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72013536, while the sum is 68.

The square root of 779687969 is about 27922.8932777390. The cubic root of 779687969 is about 920.3936441640.

The spelling of 779687969 in words is "seven hundred seventy-nine million, six hundred eighty-seven thousand, nine hundred sixty-nine".