494478109 has 2 divisors, whose sum is σ = 494478110. Its totient is φ = 494478108.

The previous prime is 494478091. The next prime is 494478191. The reversal of 494478109 is 901874494.

Together with previous prime (494478091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302655609 + 191822500 = 17397^2 + 13850^2 .

It is a cyclic number.

It is not a de Polignac number, because 494478109 - 2¹³ = 494469917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494478709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247239054 + 247239055.

It is an arithmetic number, because the mean of its divisors is an integer number (247239055).

Almost surely, 2^494478109 is an apocalyptic number.

It is an amenable number.

494478109 is a deficient number, since it is larger than the sum of its proper divisors (1).

494478109 is an equidigital number, since it uses as much as digits as its factorization.

494478109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 494478109 is about 22236.8637401950. The cubic root of 494478109 is about 790.7678849986.

The spelling of 494478109 in words is "four hundred ninety-four million, four hundred seventy-eight thousand, one hundred nine".