491951567 has 2 divisors, whose sum is σ = 491951568. Its totient is φ = 491951566.

The previous prime is 491951527. The next prime is 491951597. The reversal of 491951567 is 765159194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491951567 - 2¹⁴ = 491935183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491951527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245975783 + 245975784.

It is an arithmetic number, because the mean of its divisors is an integer number (245975784).

Almost surely, 2^491951567 is an apocalyptic number.

491951567 is a deficient number, since it is larger than the sum of its proper divisors (1).

491951567 is an equidigital number, since it uses as much as digits as its factorization.

491951567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 47.

The square root of 491951567 is about 22179.9812218135. The cubic root of 491951567 is about 789.4187718573.

The spelling of 491951567 in words is "four hundred ninety-one million, nine hundred fifty-one thousand, five hundred sixty-seven".