494642891 has 2 divisors, whose sum is σ = 494642892. Its totient is φ = 494642890.

The previous prime is 494642887. The next prime is 494642927. The reversal of 494642891 is 198246494.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 494642891 - 2² = 494642887 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (494642881) 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, 247321445 + 247321446.

It is an arithmetic number, because the mean of its divisors is an integer number (247321446).

Almost surely, 2^494642891 is an apocalyptic number.

494642891 is a deficient number, since it is larger than the sum of its proper divisors (1).

494642891 is an equidigital number, since it uses as much as digits as its factorization.

494642891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 47.

The square root of 494642891 is about 22240.5685853577. The cubic root of 494642891 is about 790.8557148672.

The spelling of 494642891 in words is "four hundred ninety-four million, six hundred forty-two thousand, eight hundred ninety-one".