491826787 has 2 divisors, whose sum is σ = 491826788. Its totient is φ = 491826786.

The previous prime is 491826767. The next prime is 491826791. The reversal of 491826787 is 787628194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491826787 is a prime.

It is not a weakly prime, because it can be changed into another prime (491826767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245913393 + 245913394.

It is an arithmetic number, because the mean of its divisors is an integer number (245913394).

Almost surely, 2^491826787 is an apocalyptic number.

491826787 is a deficient number, since it is larger than the sum of its proper divisors (1).

491826787 is an equidigital number, since it uses as much as digits as its factorization.

491826787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 52.

The square root of 491826787 is about 22177.1681465421. The cubic root of 491826787 is about 789.3520227364.

The spelling of 491826787 in words is "four hundred ninety-one million, eight hundred twenty-six thousand, seven hundred eighty-seven".