6551091 has 8 divisors (see below), whose sum is σ = 9705360. Its totient is φ = 4367376.

The previous prime is 6551087. The next prime is 6551117. The reversal of 6551091 is 1901556.

6551091 is a `hidden beast` number, since 65 + 510 + 91 = 666.

It is not a de Polignac number, because 6551091 - 2² = 6551087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 242633 = 6551091 / (6 + 5 + 5 + 1 + 0 + 9 + 1).

6551091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6551011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121290 + ... + 121343.

It is an arithmetic number, because the mean of its divisors is an integer number (1213170).

Almost surely, 2^6551091 is an apocalyptic number.

6551091 is a deficient number, since it is larger than the sum of its proper divisors (3154269).

6551091 is a wasteful number, since it uses less digits than its factorization.

6551091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242642 (or 242636 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 6551091 is about 2559.5099140265. The cubic root of 6551091 is about 187.1132508155.

The spelling of 6551091 in words is "six million, five hundred fifty-one thousand, ninety-one".