6777121 has 4 divisors (see below), whose sum is σ = 7298452. Its totient is φ = 6255792.

The previous prime is 6777103. The next prime is 6777137. The reversal of 6777121 is 1217776.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4100625 + 2676496 = 2025^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 6777121 - 2¹⁷ = 6646049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6777151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260646 + ... + 260671.

It is an arithmetic number, because the mean of its divisors is an integer number (1824613).

Almost surely, 2^6777121 is an apocalyptic number.

It is an amenable number.

6777121 is a deficient number, since it is larger than the sum of its proper divisors (521331).

6777121 is a wasteful number, since it uses less digits than its factorization.

6777121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521330.

The product of its digits is 4116, while the sum is 31.

The square root of 6777121 is about 2603.2904179135. The cubic root of 6777121 is about 189.2409327144.

The spelling of 6777121 in words is "six million, seven hundred seventy-seven thousand, one hundred twenty-one".