6531988 has 6 divisors (see below), whose sum is σ = 11430986. Its totient is φ = 3265992.

The previous prime is 6531983. The next prime is 6532003. The reversal of 6531988 is 8891356.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5895184 + 636804 = 2428^2 + 798^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6531988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6531983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 816495 + ... + 816502.

Almost surely, 2^6531988 is an apocalyptic number.

It is an amenable number.

6531988 is a deficient number, since it is larger than the sum of its proper divisors (4898998).

6531988 is a wasteful number, since it uses less digits than its factorization.

6531988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633001 (or 1632999 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 6531988 is about 2555.7754204937. The cubic root of 6531988 is about 186.9311994893.

The spelling of 6531988 in words is "six million, five hundred thirty-one thousand, nine hundred eighty-eight".