491258063 has 2 divisors, whose sum is σ = 491258064. Its totient is φ = 491258062.

The previous prime is 491258051. The next prime is 491258083. The reversal of 491258063 is 360852194.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491258063 - 2¹⁸ = 490995919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491258083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245629031 + 245629032.

It is an arithmetic number, because the mean of its divisors is an integer number (245629032).

Almost surely, 2^491258063 is an apocalyptic number.

491258063 is a deficient number, since it is larger than the sum of its proper divisors (1).

491258063 is an equidigital number, since it uses as much as digits as its factorization.

491258063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 491258063 is about 22164.3421513024. The cubic root of 491258063 is about 789.0476495977.

The spelling of 491258063 in words is "four hundred ninety-one million, two hundred fifty-eight thousand, sixty-three".