6781577 has 4 divisors (see below), whose sum is σ = 7398096. Its totient is φ = 6165060.

The previous prime is 6781559. The next prime is 6781603. The reversal of 6781577 is 7751876.

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.

It is not a de Polignac number, because 6781577 - 2⁸ = 6781321 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6781547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308243 + ... + 308264.

It is an arithmetic number, because the mean of its divisors is an integer number (1849524).

Almost surely, 2^6781577 is an apocalyptic number.

It is an amenable number.

6781577 is a deficient number, since it is larger than the sum of its proper divisors (616519).

6781577 is a wasteful number, since it uses less digits than its factorization.

6781577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616518.

The product of its digits is 82320, while the sum is 41.

The square root of 6781577 is about 2604.1461172523. The cubic root of 6781577 is about 189.2823993317.

Subtracting 6781577 from its reverse (7751876), we obtain a cube (970299 = 99³).

The spelling of 6781577 in words is "six million, seven hundred eighty-one thousand, five hundred seventy-seven".