869719789 has 2 divisors, whose sum is σ = 869719790. Its totient is φ = 869719788.

The previous prime is 869719783. The next prime is 869719793. The reversal of 869719789 is 987917968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 867773764 + 1946025 = 29458^2 + 1395^2 .

It is a cyclic number.

It is not a de Polignac number, because 869719789 - 2¹³ = 869711597 is a prime.

It is a super-2 number, since 2×869719789² = 1512825022756409042, which contains 22 as substring.

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 869719789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869719783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434859894 + 434859895.

It is an arithmetic number, because the mean of its divisors is an integer number (434859895).

Almost surely, 2^869719789 is an apocalyptic number.

It is an amenable number.

869719789 is a deficient number, since it is larger than the sum of its proper divisors (1).

869719789 is an equidigital number, since it uses as much as digits as its factorization.

869719789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 64.

The square root of 869719789 is about 29491.0120036597. The cubic root of 869719789 is about 954.5377692390.

The spelling of 869719789 in words is "eight hundred sixty-nine million, seven hundred nineteen thousand, seven hundred eighty-nine".