6981481649 has 4 divisors (see below), whose sum is σ = 6981671664. Its totient is φ = 6981291636.

The previous prime is 6981481631. The next prime is 6981481669. The reversal of 6981481649 is 9461841896.

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 a cyclic number.

It is not a de Polignac number, because 6981481649 - 2⁸ = 6981481393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6981481594 and 6981481603.

It is not an unprimeable number, because it can be changed into a prime (6981481609) 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, 20327 + ... + 119900.

It is an arithmetic number, because the mean of its divisors is an integer number (1745417916).

Almost surely, 2^6981481649 is an apocalyptic number.

It is an amenable number.

6981481649 is a deficient number, since it is larger than the sum of its proper divisors (190015).

6981481649 is a wasteful number, since it uses less digits than its factorization.

6981481649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190014.

The product of its digits is 2985984, while the sum is 56.

The square root of 6981481649 is about 83555.2610492002. The cubic root of 6981481649 is about 1911.2428201449.

The spelling of 6981481649 in words is "six billion, nine hundred eighty-one million, four hundred eighty-one thousand, six hundred forty-nine".