494257409 has 2 divisors, whose sum is σ = 494257410. Its totient is φ = 494257408.

The previous prime is 494257391. The next prime is 494257429. The reversal of 494257409 is 904752494.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 488631025 + 5626384 = 22105^2 + 2372^2 .

It is a cyclic number.

It is not a de Polignac number, because 494257409 - 2²⁴ = 477480193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 494257409.

It is not a weakly prime, because it can be changed into another prime (494257429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247128704 + 247128705.

It is an arithmetic number, because the mean of its divisors is an integer number (247128705).

Almost surely, 2^494257409 is an apocalyptic number.

It is an amenable number.

494257409 is a deficient number, since it is larger than the sum of its proper divisors (1).

494257409 is an equidigital number, since it uses as much as digits as its factorization.

494257409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 494257409 is about 22231.9007059675. The cubic root of 494257409 is about 790.6502199020.

The spelling of 494257409 in words is "four hundred ninety-four million, two hundred fifty-seven thousand, four hundred nine".