6811551 has 6 divisors (see below), whose sum is σ = 9838920. Its totient is φ = 4541028.

The previous prime is 6811517. The next prime is 6811579. The reversal of 6811551 is 1551186.

It is not a de Polignac number, because 6811551 - 2⁷ = 6811423 is a prime.

6811551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6811591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 378411 + ... + 378428.

It is an arithmetic number, because the mean of its divisors is an integer number (1639820).

Almost surely, 2^6811551 is an apocalyptic number.

6811551 is a deficient number, since it is larger than the sum of its proper divisors (3027369).

6811551 is a wasteful number, since it uses less digits than its factorization.

6811551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756845 (or 756842 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 6811551 is about 2609.8948254671. The cubic root of 6811551 is about 189.5608602378.

The spelling of 6811551 in words is "six million, eight hundred eleven thousand, five hundred fifty-one".