491984653 has 2 divisors, whose sum is σ = 491984654. Its totient is φ = 491984652.

The previous prime is 491984627. The next prime is 491984659. The reversal of 491984653 is 356489194.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 489382884 + 2601769 = 22122^2 + 1613^2 .

It is a cyclic number.

It is not a de Polignac number, because 491984653 - 2⁵ = 491984621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491984597 and 491984606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491984659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245992326 + 245992327.

It is an arithmetic number, because the mean of its divisors is an integer number (245992327).

Almost surely, 2^491984653 is an apocalyptic number.

It is an amenable number.

491984653 is a deficient number, since it is larger than the sum of its proper divisors (1).

491984653 is an equidigital number, since it uses as much as digits as its factorization.

491984653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 49.

The square root of 491984653 is about 22180.7270620239. The cubic root of 491984653 is about 789.4364688053.

The spelling of 491984653 in words is "four hundred ninety-one million, nine hundred eighty-four thousand, six hundred fifty-three".