6987561 has 48 divisors (see below), whose sum is σ = 12104064. Its totient is φ = 3497472.

The previous prime is 6987557. The next prime is 6987583. The reversal of 6987561 is 1657896.

It is not a de Polignac number, because 6987561 - 2² = 6987557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6987511) 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 47 ways as a sum of consecutive naturals, for example, 188835 + ... + 188871.

It is an arithmetic number, because the mean of its divisors is an integer number (252168).

Almost surely, 2^6987561 is an apocalyptic number.

It is an amenable number.

6987561 is a deficient number, since it is larger than the sum of its proper divisors (5116503).

6987561 is a wasteful number, since it uses less digits than its factorization.

6987561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 87 counting only the distinct ones).

The product of its digits is 90720, while the sum is 42.

The square root of 6987561 is about 2643.3995157751. The cubic root of 6987561 is about 191.1797418036.

The spelling of 6987561 in words is "six million, nine hundred eighty-seven thousand, five hundred sixty-one".