6981649 has 4 divisors (see below), whose sum is σ = 7049536. Its totient is φ = 6913764.

The previous prime is 6981631. The next prime is 6981659. The reversal of 6981649 is 9461896.

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 6981649 - 2²¹ = 4884497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6981619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33789 + ... + 33994.

It is an arithmetic number, because the mean of its divisors is an integer number (1762384).

Almost surely, 2^6981649 is an apocalyptic number.

It is an amenable number.

6981649 is a deficient number, since it is larger than the sum of its proper divisors (67887).

6981649 is a wasteful number, since it uses less digits than its factorization.

6981649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67886.

The product of its digits is 93312, while the sum is 43.

The square root of 6981649 is about 2642.2810221473. The cubic root of 6981649 is about 191.1258091299.

It can be divided in two parts, 69 and 81649, that added together give a palindrome (81718).

The spelling of 6981649 in words is "six million, nine hundred eighty-one thousand, six hundred forty-nine".