491111567 has 2 divisors, whose sum is σ = 491111568. Its totient is φ = 491111566.

The previous prime is 491111539. The next prime is 491111587. The reversal of 491111567 is 765111194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491111567 - 2⁸ = 491111311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491111587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245555783 + 245555784.

It is an arithmetic number, because the mean of its divisors is an integer number (245555784).

Almost surely, 2^491111567 is an apocalyptic number.

491111567 is a deficient number, since it is larger than the sum of its proper divisors (1).

491111567 is an equidigital number, since it uses as much as digits as its factorization.

491111567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 35.

The square root of 491111567 is about 22161.0371372822. The cubic root of 491111567 is about 788.9692089402.

The spelling of 491111567 in words is "four hundred ninety-one million, one hundred eleven thousand, five hundred sixty-seven".