10661191 has 2 divisors, whose sum is σ = 10661192. Its totient is φ = 10661190.

The previous prime is 10661177. The next prime is 10661201. The reversal of 10661191 is 19116601.

10661191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10661191 - 2⁹ = 10660679 is a prime.

It is a super-2 number, since 2×10661191² = 227321987076962, which contains 22 as substring.

It is equal to p₇₀₅₅₇₁ and since 10661191 and 705571 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10661111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330595 + 5330596.

It is an arithmetic number, because the mean of its divisors is an integer number (5330596).

Almost surely, 2^10661191 is an apocalyptic number.

10661191 is a deficient number, since it is larger than the sum of its proper divisors (1).

10661191 is an equidigital number, since it uses as much as digits as its factorization.

10661191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 10661191 is about 3265.1479292675. The cubic root of 10661191 is about 220.0908096187.

Adding to 10661191 its reverse (19116601), we get a palindrome (29777792).

The spelling of 10661191 in words is "ten million, six hundred sixty-one thousand, one hundred ninety-one".