6550391 has 4 divisors (see below), whose sum is σ = 6573984. Its totient is φ = 6526800.

The previous prime is 6550367. The next prime is 6550403. The reversal of 6550391 is 1930556.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6550391 is a prime.

It is a pancake number, because a pancake can be divided into 6550391 parts by 3619 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6550361) 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, 11375 + ... + 11936.

It is an arithmetic number, because the mean of its divisors is an integer number (1643496).

Almost surely, 2^6550391 is an apocalyptic number.

6550391 is a deficient number, since it is larger than the sum of its proper divisors (23593).

6550391 is a wasteful number, since it uses less digits than its factorization.

6550391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23592.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 6550391 is about 2559.3731654450. The cubic root of 6550391 is about 187.1065860762.

The spelling of 6550391 in words is "six million, five hundred fifty thousand, three hundred ninety-one".