6551651 has 4 divisors (see below), whose sum is σ = 6777600. Its totient is φ = 6325704.

The previous prime is 6551639. The next prime is 6551653. The reversal of 6551651 is 1561556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6551651 - 2²² = 2357347 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 225919 = 6551651 / (6 + 5 + 5 + 1 + 6 + 5 + 1).

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (6551653) 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, 112931 + ... + 112988.

It is an arithmetic number, because the mean of its divisors is an integer number (1694400).

Almost surely, 2^6551651 is an apocalyptic number.

6551651 is a deficient number, since it is larger than the sum of its proper divisors (225949).

6551651 is a wasteful number, since it uses less digits than its factorization.

6551651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225948.

The product of its digits is 4500, while the sum is 29.

The square root of 6551651 is about 2559.6193076315. The cubic root of 6551651 is about 187.1185822651.

The spelling of 6551651 in words is "six million, five hundred fifty-one thousand, six hundred fifty-one".