491763887 has 2 divisors, whose sum is σ = 491763888. Its totient is φ = 491763886.

The previous prime is 491763869. The next prime is 491763911. The reversal of 491763887 is 788367194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491763887 - 2⁶ = 491763823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491763827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245881943 + 245881944.

It is an arithmetic number, because the mean of its divisors is an integer number (245881944).

Almost surely, 2^491763887 is an apocalyptic number.

491763887 is a deficient number, since it is larger than the sum of its proper divisors (1).

491763887 is an equidigital number, since it uses as much as digits as its factorization.

491763887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 53.

The square root of 491763887 is about 22175.7499760437. The cubic root of 491763887 is about 789.3183710795.

The spelling of 491763887 in words is "four hundred ninety-one million, seven hundred sixty-three thousand, eight hundred eighty-seven".