491097611 has 2 divisors, whose sum is σ = 491097612. Its totient is φ = 491097610.

The previous prime is 491097589. The next prime is 491097671. The reversal of 491097611 is 116790194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491097611 - 2¹⁰ = 491096587 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (491097671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245548805 + 245548806.

It is an arithmetic number, because the mean of its divisors is an integer number (245548806).

Almost surely, 2^491097611 is an apocalyptic number.

491097611 is a deficient number, since it is larger than the sum of its proper divisors (1).

491097611 is an equidigital number, since it uses as much as digits as its factorization.

491097611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 491097611 is about 22160.7222580854. The cubic root of 491097611 is about 788.9617354458.

The spelling of 491097611 in words is "four hundred ninety-one million, ninety-seven thousand, six hundred eleven".