6781005001 has 4 divisors (see below), whose sum is σ = 6781171072. Its totient is φ = 6780838932.

The previous prime is 6781004983. The next prime is 6781005017. The reversal of 6781005001 is 1005001876.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6781005001 - 2²³ = 6772616393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6781005401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25516 + ... + 119218.

It is an arithmetic number, because the mean of its divisors is an integer number (1695292768).

Almost surely, 2^6781005001 is an apocalyptic number.

It is an amenable number.

6781005001 is a deficient number, since it is larger than the sum of its proper divisors (166071).

6781005001 is an equidigital number, since it uses as much as digits as its factorization.

6781005001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166070.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 6781005001 is about 82346.8578696237. The cubic root of 6781005001 is about 1892.7707744329.

Adding to 6781005001 its reverse (1005001876), we get a palindrome (7786006877).

The spelling of 6781005001 in words is "six billion, seven hundred eighty-one million, five thousand, one".