491418853 has 2 divisors, whose sum is σ = 491418854. Its totient is φ = 491418852.

The previous prime is 491418841. The next prime is 491418877. The reversal of 491418853 is 358814194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434597409 + 56821444 = 20847^2 + 7538^2 .

It is a cyclic number.

It is not a de Polignac number, because 491418853 - 2⁵ = 491418821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491418883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245709426 + 245709427.

It is an arithmetic number, because the mean of its divisors is an integer number (245709427).

Almost surely, 2^491418853 is an apocalyptic number.

It is an amenable number.

491418853 is a deficient number, since it is larger than the sum of its proper divisors (1).

491418853 is an equidigital number, since it uses as much as digits as its factorization.

491418853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 43.

The square root of 491418853 is about 22167.9690770264. The cubic root of 491418853 is about 789.1337259677.

The spelling of 491418853 in words is "four hundred ninety-one million, four hundred eighteen thousand, eight hundred fifty-three".