77911 has 4 divisors (see below), whose sum is σ = 82512. Its totient is φ = 73312.

The previous prime is 77899. The next prime is 77929. The reversal of 77911 is 11977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77911 - 2⁷ = 77783 is a prime.

It is a Duffinian number.

77911 is a lucky number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77951) 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, 2275 + ... + 2308.

It is an arithmetic number, because the mean of its divisors is an integer number (20628).

2⁷⁷⁹¹¹ is an apocalyptic number.

77911 is a deficient number, since it is larger than the sum of its proper divisors (4601).

77911 is a wasteful number, since it uses less digits than its factorization.

77911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4600.

The product of its digits is 441, while the sum is 25.

The square root of 77911 is about 279.1254198385. The cubic root of 77911 is about 42.7103299219.

The spelling of 77911 in words is "seventy-seven thousand, nine hundred eleven".