77189669 has 2 divisors, whose sum is σ = 77189670. Its totient is φ = 77189668.

The previous prime is 77189657. The next prime is 77189701. The reversal of 77189669 is 96698177.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52736644 + 24453025 = 7262^2 + 4945^2 .

It is a cyclic number.

It is not a de Polignac number, because 77189669 - 2⁴ = 77189653 is a prime.

It is a super-2 number, since 2×77189669² = 11916490000659122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77189669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77189069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38594834 + 38594835.

It is an arithmetic number, because the mean of its divisors is an integer number (38594835).

Almost surely, 2^77189669 is an apocalyptic number.

It is an amenable number.

77189669 is a deficient number, since it is larger than the sum of its proper divisors (1).

77189669 is an equidigital number, since it uses as much as digits as its factorization.

77189669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The square root of 77189669 is about 8785.7651345799. The cubic root of 77189669 is about 425.7811129838.

The spelling of 77189669 in words is "seventy-seven million, one hundred eighty-nine thousand, six hundred sixty-nine".