6638091 has 16 divisors (see below), whose sum is σ = 9144576. Its totient is φ = 4281056.

The previous prime is 6638069. The next prime is 6638101. The reversal of 6638091 is 1908366.

It is a cyclic number.

It is not a de Polignac number, because 6638091 - 2¹⁰ = 6637067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6638491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12946 + ... + 13448.

It is an arithmetic number, because the mean of its divisors is an integer number (571536).

Almost surely, 2^6638091 is an apocalyptic number.

6638091 is a deficient number, since it is larger than the sum of its proper divisors (2506485).

6638091 is a wasteful number, since it uses less digits than its factorization.

6638091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 6638091 is about 2576.4493008790. The cubic root of 6638091 is about 187.9379133295.

The spelling of 6638091 in words is "six million, six hundred thirty-eight thousand, ninety-one".