769139689 has 2 divisors, whose sum is σ = 769139690. Its totient is φ = 769139688.

The previous prime is 769139671. The next prime is 769139719. The reversal of 769139689 is 986931967.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 716097600 + 53042089 = 26760^2 + 7283^2 .

It is a cyclic number.

It is not a de Polignac number, because 769139689 - 2⁷ = 769139561 is a prime.

It is a super-2 number, since 2×769139689² = 1183151722390033442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (769139629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384569844 + 384569845.

It is an arithmetic number, because the mean of its divisors is an integer number (384569845).

Almost surely, 2^769139689 is an apocalyptic number.

It is an amenable number.

769139689 is a deficient number, since it is larger than the sum of its proper divisors (1).

769139689 is an equidigital number, since it uses as much as digits as its factorization.

769139689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 58.

The square root of 769139689 is about 27733.3677904433. The cubic root of 769139689 is about 916.2241625926.

The spelling of 769139689 in words is "seven hundred sixty-nine million, one hundred thirty-nine thousand, six hundred eighty-nine".