491666453 has 2 divisors, whose sum is σ = 491666454. Its totient is φ = 491666452.

The previous prime is 491666447. The next prime is 491666459. The reversal of 491666453 is 354666194.

It is a balanced prime because it is at equal distance from previous prime (491666447) and next prime (491666459).

It can be written as a sum of positive squares in only one way, i.e., 307195729 + 184470724 = 17527^2 + 13582^2 .

It is a cyclic number.

It is not a de Polignac number, because 491666453 - 2⁴ = 491666437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491666459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245833226 + 245833227.

It is an arithmetic number, because the mean of its divisors is an integer number (245833227).

Almost surely, 2^491666453 is an apocalyptic number.

It is an amenable number.

491666453 is a deficient number, since it is larger than the sum of its proper divisors (1).

491666453 is an equidigital number, since it uses as much as digits as its factorization.

491666453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 44.

The square root of 491666453 is about 22173.5530080319. The cubic root of 491666453 is about 789.2662379807.

The spelling of 491666453 in words is "four hundred ninety-one million, six hundred sixty-six thousand, four hundred fifty-three".