6551491 has 4 divisors (see below), whose sum is σ = 6585984. Its totient is φ = 6517000.

The previous prime is 6551429. The next prime is 6551497. The reversal of 6551491 is 1941556.

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 6551491 - 2²¹ = 4454339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6551497) 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, 16960 + ... + 17341.

It is an arithmetic number, because the mean of its divisors is an integer number (1646496).

Almost surely, 2^6551491 is an apocalyptic number.

6551491 is a deficient number, since it is larger than the sum of its proper divisors (34493).

6551491 is a wasteful number, since it uses less digits than its factorization.

6551491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34492.

The product of its digits is 5400, while the sum is 31.

The square root of 6551491 is about 2559.5880527929. The cubic root of 6551491 is about 187.1170590248.

The spelling of 6551491 in words is "six million, five hundred fifty-one thousand, four hundred ninety-one".