6781149 has 6 divisors (see below), whose sum is σ = 9795006. Its totient is φ = 4520760.

The previous prime is 6781141. The next prime is 6781153. The reversal of 6781149 is 9411876.

It can be written as a sum of positive squares in only one way, i.e., 4485924 + 2295225 = 2118^2 + 1515^2 .

It is not a de Polignac number, because 6781149 - 2³ = 6781141 is a prime.

It is an Ulam number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6781141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 376722 + ... + 376739.

It is an arithmetic number, because the mean of its divisors is an integer number (1632501).

Almost surely, 2^6781149 is an apocalyptic number.

It is an amenable number.

6781149 is a deficient number, since it is larger than the sum of its proper divisors (3013857).

6781149 is a wasteful number, since it uses less digits than its factorization.

6781149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753467 (or 753464 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 6781149 is about 2604.0639393072. The cubic root of 6781149 is about 189.2784172406.

The spelling of 6781149 in words is "six million, seven hundred eighty-one thousand, one hundred forty-nine".