77109 has 4 divisors (see below), whose sum is σ = 102816. Its totient is φ = 51404.

The previous prime is 77101. The next prime is 77137. The reversal of 77109 is 90177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90177 = 3 ⋅30059.

It is a cyclic number.

It is not a de Polignac number, because 77109 - 2³ = 77101 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12849 + ... + 12854.

It is an arithmetic number, because the mean of its divisors is an integer number (25704).

2⁷⁷¹⁰⁹ is an apocalyptic number.

It is an amenable number.

77109 is a deficient number, since it is larger than the sum of its proper divisors (25707).

77109 is a wasteful number, since it uses less digits than its factorization.

77109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25706.

The product of its (nonzero) digits is 441, while the sum is 24.

The square root of 77109 is about 277.6850734195. The cubic root of 77109 is about 42.5632736873.

The spelling of 77109 in words is "seventy-seven thousand, one hundred nine".