6618191 has 2 divisors, whose sum is σ = 6618192. Its totient is φ = 6618190.

The previous prime is 6618169. The next prime is 6618197. The reversal of 6618191 is 1918166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6618191 - 2⁶ = 6618127 is a prime.

It is a super-2 number, since 2×6618191² = 87600904224962, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6618197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3309095 + 3309096.

It is an arithmetic number, because the mean of its divisors is an integer number (3309096).

Almost surely, 2^6618191 is an apocalyptic number.

6618191 is a deficient number, since it is larger than the sum of its proper divisors (1).

6618191 is an equidigital number, since it uses as much as digits as its factorization.

6618191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 32.

The square root of 6618191 is about 2572.5844981263. The cubic root of 6618191 is about 187.7499221337.

The spelling of 6618191 in words is "six million, six hundred eighteen thousand, one hundred ninety-one".